Bump docker/build-push-action from 5 to 6 (#91)

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](docker/build-push-action@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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/buildx-on-pr.yml

@@ -29,7 +29,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
       -
         name: Initial Buildx
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: Dockerfile
@@ -50,7 +50,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
       -
         name: Buildx and Push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         if: github.actor == github.event.repository.owner.login
         with:
           context: .

.github/workflows/buildx.yml

@@ -34,7 +34,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
       -
         name: Initial Buildx
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: Dockerfile
@@ -78,7 +78,7 @@ jobs:
       # 
       -
         name: Buildx and Push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: Dockerfile