Bump docker/metadata-action from 5.4.0 to 5.5.1 (#766)

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 5.4.0 to 5.5.1.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](docker/metadata-action@9dc751f...8e5442c)

---
updated-dependencies:
- dependency-name: docker/metadata-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/cicd.yml

@@ -150,7 +150,7 @@ jobs:
         password: ${{ secrets.YHTEENTOIMIVUUSPALVELUT_QUAY_IO_PASSWORD }}
     - name: Docker meta
       id: meta
-      uses: docker/metadata-action@9dc751fe249ad99385a2583ee0d084c400eee04e  # v5.4.0
+      uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81  # v5.5.1
       with:
         images: quay.io/natlibfi/annif
         tags: |
@@ -189,7 +189,7 @@ jobs:
         password: ${{ secrets.YHTEENTOIMIVUUSPALVELUT_QUAY_IO_PASSWORD }}
     - name: Docker meta
       id: meta
-      uses: docker/metadata-action@9dc751fe249ad99385a2583ee0d084c400eee04e  # v5.4.0
+      uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81  # v5.5.1
       with:
         images: quay.io/natlibfi/annif
         tags: |

.github/workflows/docker-rebuild.yml

@@ -25,7 +25,7 @@ jobs:
         password: ${{ secrets.YHTEENTOIMIVUUSPALVELUT_QUAY_IO_PASSWORD }}
     - name: Docker meta
       id: meta
-      uses: docker/metadata-action@9dc751fe249ad99385a2583ee0d084c400eee04e  # v5.4.0
+      uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81  # v5.5.1
       with:
         images: quay.io/natlibfi/annif
         flavor: |