Update docker/metadata-action version comment

Change comment from v5 to more specific v5.8.0

Signed-off-by: James Taylor <[email protected]>

Author: jt-nti

.github/workflows/docker-build.yml

@@ -36,7 +36,7 @@ jobs:
       uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
     - name: Docker meta
       id: meta
-      uses: docker/metadata-action@c1e51972afc2121e065aed6d45c65596fe445f3f # v5
+      uses: docker/metadata-action@c1e51972afc2121e065aed6d45c65596fe445f3f # v5.8.0
       with:
         images: |
           ${{ inputs.image-name }}