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

@@ -30,19 +30,6 @@ jobs:
         with:
           targets: ${{ matrix.target }}
 
-      - name: Cache cargo + build artifacts
-        uses: actions/cache@v3
-        with:
-          path: |
-            ~/.cargo/registry
-            ~/.cargo/git
-            target
-          key: ${{ runner.os }}-${{ matrix.arch }}-cargo-${{ hashFiles('Cargo.lock') }}
-          # Reuse a prior build's compiled deps (pipewire-sys/bindgen is slow,
-          # especially on the aarch64 host) even when Cargo.lock changed.
-          restore-keys: |
-            ${{ runner.os }}-${{ matrix.arch }}-cargo-
-
       - name: Ensure audio build deps (libpipewire + clang for native capture)
         run: |
           if command -v apt-get >/dev/null; then