Bump docker/build-push-action from 5 to 6 (#29)

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/build-pgpool.yml

@@ -47,7 +47,7 @@ jobs:
             type=ref,event=pr
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           file: Dockerfile.pgpool
           platforms: linux/amd64, linux/arm64/v8, linux/ppc64le

.github/workflows/build.yml

@@ -46,7 +46,7 @@ jobs:
             type=ref,event=pr
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           platforms: linux/amd64, linux/arm64/v8, linux/ppc64le
           push: ${{ github.event_name != 'pull_request' && github.event_name != 'merge_group' }}

.github/workflows/release-pgpool.yml

@@ -54,7 +54,7 @@ jobs:
             type=ref,event=pr
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           file: Dockerfile.pgpool
           platforms: linux/amd64, linux/arm64/v8, linux/ppc64le

.github/workflows/release.yml

@@ -72,7 +72,7 @@ jobs:
 
       - name: Build and push Docker image for latest release
         if: env.BRANCH == env.LATEST
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           platforms: linux/amd64, linux/arm64/v8, linux/ppc64le
           push: ${{ github.event_name != 'pull_request' }}
@@ -81,7 +81,7 @@ jobs:
 
       - name: Build and push Docker image for other releases
         if: env.BRANCH != env.LATEST
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           platforms: linux/amd64, linux/arm64/v8, linux/ppc64le
           push: ${{ github.event_name != 'pull_request' }}