Bump docker/build-push-action from 5 to 6 (#37)

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/docker_build_lichen.yml

@@ -26,7 +26,7 @@ jobs:
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v3
     - name: Build Docker image
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         context: images/lichen
         platforms: linux/amd64 # no need for other platforms

.github/workflows/docker_update_lichen.yml

@@ -54,7 +54,7 @@ jobs:
         username: ${{ secrets.DOCKER_USERNAME }}
         password: ${{ secrets.DOCKER_PASSWORD }}
     - name: Build and push Docker image
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         context: images/lichen
         platforms: linux/amd64 # no need for other platforms

.github/workflows/docker_update_toolbox.yml

@@ -61,7 +61,7 @@ jobs:
         password: ${{ secrets.DOCKER_PASSWORD }}
     - name: Build and push Docker image
       id: build
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         context: images/toolbox
         platforms: linux/amd64,linux/arm64,linux/arm/v7