Update MIGRATIONS.MD for version 0.8.0 changes

Added migration notes for version 0.8.0 regarding saml2 deprecation and its alternatives.

MIGRATIONS.MD

@@ -2,6 +2,12 @@
 
 This is a best effort document descibing neccecary changes you might have to do when updating
 
+## 0.8.0
+
+`saml2` is no longer enabled, as it depends on vulnerable dependencies and isnt really built in nixpks anymore.
+
+If you need to authenticate with saml, you should deploy some sort of saml to openid bridge, instead.
+
 ## 0.6.1
 
 enableSlidingSync, and setting matrix-synapse.sliding-sync.environmentFile (or any other sliding-sync setting)

synapse-module/default.nix

@@ -19,7 +19,6 @@ let
     inherit (cfg) plugins;
     extras = [
       "postgres"
-      "saml2"
       "oidc"
       "systemd"
       "url-preview"
@@ -27,7 +26,6 @@ let
       "jwt"
       "redis"
       "cache-memory"
-      "user-search"
     ];
   };