Update docker/metadata-action digest to 12d9b9a

Author: renovate[bot]

.github/workflows/docker-publish.yml

@@ -62,7 +62,7 @@ jobs:
       # https://github.com/docker/metadata-action
       - name: Extract Docker metadata
         id: meta
-        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        uses: docker/metadata-action@12d9b9a905eda64a7255fe54e5dd14b7f0624941
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}