enhance(ci): improve release workflow with concurrency control and updated dependencies

- Add concurrency control to prevent multiple simultaneous releases
- Upgrade softprops/action-gh-release from v1 to v2 for better reliability
- Add docs/ directory to .gitignore to exclude documentation build artifacts

.github/workflows/release.yml

@@ -8,6 +8,10 @@ on:
 permissions:
   contents: write
 
+concurrency:
+  group: release-${{ github.ref_name }}
+  cancel-in-progress: true
+
 jobs:
   release:
     runs-on: ${{ matrix.os }}
@@ -257,7 +261,7 @@ jobs:
           fi
 
       - name: Upload Release Assets
-        uses: softprops/action-gh-release@v1
+        uses: softprops/action-gh-release@v2
         with:
           tag_name: ${{ github.ref_name }}
           name: CC Switch ${{ github.ref_name }}