properly quote python version in github action

Author: lukasbindreiter

.github/workflows/protovalidate-gencode-pypi-sync.yaml

@@ -23,7 +23,7 @@ jobs:
           go-version: stable
       - uses: astral-sh/setup-uv@v6
         with:
-          python-version: 3.10
+          python-version: "3.10"
       - name: Install dependencies
         run: cd bufbuild-protovalidate-protocolbuffers && uv sync --frozen && make build && rm -rf dist
       - name: Build and publish