Bump docker/build-push-action from 5 to 6

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]>

.github/workflows/build.yml

@@ -55,7 +55,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Build image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           platforms: ${{ matrix.platform }}
           target: runtime
@@ -69,7 +69,7 @@ jobs:
 
       - name: Push developer image
         if: ${{ github.event_name == 'push' && github.ref_type == 'tag' }}
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           platforms: ${{ matrix.platform }}
           target: developer
@@ -82,7 +82,7 @@ jobs:
 
       - name: Push runtime image
         if: ${{ github.event_name == 'push' && github.ref_type == 'tag' }}
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           platforms: ${{ matrix.platform }}
           target: runtime