chore(deps): bump docker/build-push-action from 5 to 6 (MisskeyIO#651)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 5 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v5...v6)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  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>

.github/workflows/docker-beta.yml

@@ -34,7 +34,7 @@ jobs:
         run: |
           echo "FORMATTED_BRANCH_NAME=$(echo ${{ github.ref_name }} | sed -e 's/\//-/g' )" >> $GITHUB_ENV
       - name: Build and Push to GitHub Container Registry
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           builder: ${{ steps.buildx.outputs.name }}
           context: .

.github/workflows/docker-host.yml

@@ -36,7 +36,7 @@ jobs:
         run: |
           echo "FORMATTED_BRANCH_NAME=$(echo ${{ github.ref_name }} | sed -e 's/\//-/g' )" >> $GITHUB_ENV
       - name: Build and Push to GitHub Container Registry
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           builder: ${{ steps.buildx.outputs.name }}
           context: .

.github/workflows/docker-io.yml

@@ -36,7 +36,7 @@ jobs:
         run: |
           echo "FORMATTED_BRANCH_NAME=$(echo ${{ github.ref_name }} | sed -e 's/\//-/g' )" >> $GITHUB_ENV
       - name: Build and Push to GitHub Container Registry
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           builder: ${{ steps.buildx.outputs.name }}
           context: .

.github/workflows/dockle.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
       - name: Build an image from Dockerfile
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           push: false