GHA: Upgrade to Python 3

.github/workflows/coverity.yml

@@ -25,7 +25,7 @@ jobs:
               if: startsWith(matrix.os, 'ubuntu')
               run: |
                 sudo apt-get update -qq
-                sudo apt-get install -y bison comerr-dev flex libcap-ng-dev libdb-dev libedit-dev libjson-perl libldap2-dev libncurses5-dev libperl4-corelibs-perl libsqlite3-dev libkeyutils-dev pkg-config python ss-dev texinfo unzip netbase keyutils ldap-utils gdb apport curl libmicrohttpd-dev clang-tools clang-format jq valgrind
+                sudo apt-get install -y bison comerr-dev flex libcap-ng-dev libdb-dev libedit-dev libjson-perl libldap2-dev libncurses5-dev libperl4-corelibs-perl libsqlite3-dev libkeyutils-dev pkg-config python3 ss-dev texinfo unzip netbase keyutils ldap-utils gdb apport curl libmicrohttpd-dev clang-tools clang-format jq valgrind
                 # Temporary workaround for:
                 # https://github.com/actions/virtual-environments/issues/3185
                 sudo hostname localhost

.github/workflows/linux-mit-interop.yml

@@ -31,7 +31,7 @@ jobs:
                 sudo apt-get install -y bison comerr-dev flex doxygen
                 sudo apt-get install -y libcap-ng-dev libdb-dev libedit-dev libjson-perl
                 sudo apt-get install -y libldap2-dev libncurses5-dev libperl4-corelibs-perl
-                sudo apt-get install -y libsqlite3-dev libkeyutils-dev pkg-config python
+                sudo apt-get install -y libsqlite3-dev libkeyutils-dev pkg-config python3
                 sudo apt-get install -y ss-dev texinfo unzip netbase keyutils ldap-utils
                 sudo apt-get install -y gdb apport curl libmicrohttpd-dev jq valgrind
             - name: Install MIT Kerberos dependencies

.github/workflows/linux.yml

@@ -74,7 +74,7 @@ jobs:
                 sudo apt-get install -y bison comerr-dev flex doxygen
                 sudo apt-get install -y libcap-ng-dev libdb-dev libedit-dev libjson-perl
                 sudo apt-get install -y libldap2-dev libncurses5-dev libperl4-corelibs-perl
-                sudo apt-get install -y libsqlite3-dev libkeyutils-dev pkg-config python
+                sudo apt-get install -y libsqlite3-dev libkeyutils-dev pkg-config python3
                 sudo apt-get install -y ss-dev texinfo unzip netbase keyutils ldap-utils
                 sudo apt-get install -y gdb apport curl libmicrohttpd-dev jq valgrind
                 # Temporary workaround for:

.github/workflows/osx.yml

@@ -64,7 +64,7 @@ jobs:
             - name: Install packages
               run: |
                 echo "bison, flex, ncurses, texinfo, and unzip are in the base OS."
-                echo "berkeley-db, perl, python, curl, and jq are installed in the"
+                echo "berkeley-db, perl, python3, curl, and jq are installed in the"
                 echo "base image already."
                 brew install autoconf automake libtool cpanm texinfo texi2html
                 sudo cpanm install JSON

.github/workflows/scanbuild.yml

@@ -29,7 +29,7 @@ jobs:
               if: startsWith(matrix.os, 'ubuntu')
               run: |
                 sudo apt-get update -qq
-                sudo apt-get install -y bison comerr-dev flex libcap-ng-dev libdb-dev libedit-dev libjson-perl libldap2-dev libncurses5-dev libperl4-corelibs-perl libsqlite3-dev libkeyutils-dev pkg-config python ss-dev texinfo unzip netbase keyutils ldap-utils gdb apport curl libmicrohttpd-dev clang-tools clang-format jq valgrind
+                sudo apt-get install -y bison comerr-dev flex libcap-ng-dev libdb-dev libedit-dev libjson-perl libldap2-dev libncurses5-dev libperl4-corelibs-perl libsqlite3-dev libkeyutils-dev pkg-config python3 ss-dev texinfo unzip netbase keyutils ldap-utils gdb apport curl libmicrohttpd-dev clang-tools clang-format jq valgrind
                 # Temporary workaround for:
                 # https://github.com/actions/virtual-environments/issues/3185
                 sudo hostname localhost

.github/workflows/ubsan.yml

@@ -76,7 +76,7 @@ jobs:
                 sudo apt-get install -y bison comerr-dev flex doxygen
                 sudo apt-get install -y libcap-ng-dev libdb-dev libedit-dev libjson-perl
                 sudo apt-get install -y libldap2-dev libncurses5-dev libperl4-corelibs-perl
-                sudo apt-get install -y libsqlite3-dev libkeyutils-dev pkg-config python
+                sudo apt-get install -y libsqlite3-dev libkeyutils-dev pkg-config python3
                 sudo apt-get install -y ss-dev texinfo unzip netbase keyutils ldap-utils
                 sudo apt-get install -y gdb apport curl libmicrohttpd-dev jq valgrind
                 # Temporary workaround for:

.github/workflows/valgrind.yml

@@ -29,7 +29,7 @@ jobs:
               if: startsWith(matrix.os, 'ubuntu')
               run: |
                 sudo apt-get update -qq
-                sudo apt-get install -y bison comerr-dev flex libcap-ng-dev lmdb-utils liblmdb-dev libdb-dev libedit-dev libjson-perl libldap2-dev libncurses5-dev libperl4-corelibs-perl libsqlite3-dev libkeyutils-dev pkg-config python ss-dev texinfo unzip netbase keyutils ldap-utils gdb apport curl libmicrohttpd-dev jq valgrind
+                sudo apt-get install -y bison comerr-dev flex libcap-ng-dev lmdb-utils liblmdb-dev libdb-dev libedit-dev libjson-perl libldap2-dev libncurses5-dev libperl4-corelibs-perl libsqlite3-dev libkeyutils-dev pkg-config python3 ss-dev texinfo unzip netbase keyutils ldap-utils gdb apport curl libmicrohttpd-dev jq valgrind
                 # Temporary workaround for:
                 # https://github.com/actions/virtual-environments/issues/3185
                 sudo hostname localhost