ci: give write permission to release job

.github/workflows/c-cpp.yml

@@ -70,6 +70,8 @@ jobs:
     runs-on: ubuntu-latest
     if: github.ref == 'refs/heads/port'
     needs: [build-i686-windows, build-i686-linux]
+    permissions:
+      contents: write
     steps:
       - uses: actions/checkout@v4
       - uses: actions/download-artifact@v4