Bump docker/metadata-action from 5.7.0 to 6.0.0 (#8703)

Bumps [docker/metadata-action](https://github.com/docker/metadata-action) from 5.7.0 to 6.0.0.
- [Release notes](https://github.com/docker/metadata-action/releases)
- [Commits](docker/metadata-action@902fa8e...030e881)

---
updated-dependencies:
- dependency-name: docker/metadata-action
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/docker-publish.yaml

@@ -13,7 +13,7 @@ jobs:
         uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 #v5.0.0
       - name: Extract metadata (tags, labels) for Docker
         id: meta
-        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804 #5.7.0
+        uses: docker/metadata-action@030e881283bb7a6894de51c315a6bfe6a94e05cf #6.0.0
         with:
           images: weaveworks/eksctl
       - name: Log in to Docker Hub

.github/workflows/ecr-publish.yaml

@@ -32,7 +32,7 @@ jobs:
 
       - name: Extract metadata (tags, labels)
         id: meta
-        uses: docker/metadata-action@902fa8ec7d6ecbf8d84d538b9b233a880e428804 #5.7.0
+        uses: docker/metadata-action@030e881283bb7a6894de51c315a6bfe6a94e05cf #6.0.0
         env:
           REGISTRY: ${{ steps.login-ecr-public.outputs.registry }}
           REGISTRY_ALIAS: eksctl