.gitea/workflows: remove rust cache step

This is broken and just takes a bunch of time, removing it for now

.gitea/workflows/build.yml

@@ -17,9 +17,6 @@ jobs:
             toolchain: stable
             override: true
 
-      - name: Build or restore dependency cache
-        uses: Swatinem/rust-cache@v2
-
       - name: Build
         run: cargo build --all-features --verbose --release
 
@@ -35,9 +32,6 @@ jobs:
             override: true
             components: rustfmt, clippy
 
-      - name: Build or restore dependency cache
-        uses: Swatinem/rust-cache@v2
-
       - name: Check code format
         run: cargo fmt -- --check
 
@@ -55,9 +49,6 @@ jobs:
             toolchain: stable
             override: true
 
-      - name: Build or restore dependency cache
-        uses: Swatinem/rust-cache@v2
-
       - name: Build docs
         run: cargo doc --all-features --document-private-items --release