CI: drop actions/cache — the Gitea cache backend times out (CreateCacheEntry), so it only added retry delay and never saved/restored

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GLUwWE2KmFPzhKaf67tWbx

.gitea/workflows/release.yml

@@ -28,14 +28,6 @@ jobs:
         with:
           targets: wasm32-unknown-unknown
 
-      - name: Cache cargo registry and tools
-        uses: actions/cache@v3
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/bin
-          key: ${{ runner.os }}-${{ matrix.arch }}-cargo-leptos-${{ hashFiles('Cargo.lock') }}
-
       - name: Install cargo-binstall
         run: |
           command -v cargo-binstall || \