chore(deps): update pypa/gh-action-pypi-publish digest to ec4db0b (GoogleCloudPlatform#334)

Co-authored-by: Jeremy Fehr <[email protected]>

Author: renovate-bot

.github/workflows/release.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Build distributions
         run: python -m build
       - name: Publish
-        uses: pypa/gh-action-pypi-publish@699cd6103f50bf5c3b2f070c70712d109c168e6c # main
+        uses: pypa/gh-action-pypi-publish@ec4db0b4ddc65acdf4bff5fa45ac92d78b56bdf0 # main
         with:
           user: __token__
           password: ${{ secrets.PYPI_API_TOKEN }}