adjusting semver tag of a step in publish workflow (#2785)

This is a critical fix for https://github.com/docker-mailserver/docker-mailserver/actions/runs/3095956307/jobs/5011369215 so we can properly publish images again.

.github/workflows/generic_build.yml

@@ -12,7 +12,6 @@ on:
         description: The cache key to use when restoring an image later
         value: ${{ jobs.build-image.outputs.build-cache-key }}
 
-
 permissions:
   contents: read
 

.github/workflows/generic_publish.yml

@@ -23,7 +23,7 @@ jobs:
 
       - name: 'Prepare tags'
         id: prep
-        uses: docker/metadata-action@v4.0
+        uses: docker/metadata-action@v4.0.1
         with:
           images: |
             ${{ secrets.DOCKER_REPOSITORY }}