Bump docker/build-push-action from 5 to 6 (#203)

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>

Author: dependabot[bot]

.github/workflows/nightly.yml

@@ -51,7 +51,7 @@ jobs:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
       - name: Build/Push to Docker Hub
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           push: true
           file: Dockerfile.${{ matrix.target }}
@@ -64,7 +64,7 @@ jobs:
           username: ${{ secrets.REGISTRY_USER }}
           password: ${{ secrets.PTA }}
       - name: Build/Push to github.com
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           push: true
           file: Dockerfile.${{ matrix.target }}

.github/workflows/releases.yml

@@ -51,7 +51,7 @@ jobs:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
       - name: Push to Docker Hub
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           push: true
           file: Dockerfile.${{ matrix.target }}
@@ -67,7 +67,7 @@ jobs:
           username: ${{ secrets.REGISTRY_USER }}
           password: ${{ secrets.PTA }}
       - name: Build/Push to github.com
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           push: true
           file: Dockerfile.${{ matrix.target }}