Bump docker/build-push-action from 6.16.0 to 6.18.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.16.0 to 6.18.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@14487ce...2634353)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: 6.18.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/docker.yml

@@ -108,7 +108,7 @@ jobs:
             org.oxidize-rb.ruby.platform=${{ env.ruby_platform }}
 
       - name: Docker build
-        uses: docker/build-push-action@14487ce63c7a62a4a324b0bfb37086795e31c6c1 # v6
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6
         with:
           builder: ${{ steps.buildx.outputs.name }}
           context: ./docker
@@ -199,7 +199,7 @@ jobs:
           category: "docker-${{ env.ruby_platform }}"
 
       - name: Docker push
-        uses: docker/build-push-action@14487ce63c7a62a4a324b0bfb37086795e31c6c1 # v6
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6
         with:
           builder: ${{ steps.buildx.outputs.name }}
           context: ./docker

.github/workflows/integration.yml

@@ -116,7 +116,7 @@ jobs:
           cat Gemfile.issue
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@14487ce63c7a62a4a324b0bfb37086795e31c6c1 # v6
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6
         with:
           context: .
           file: ./Dockerfile.issue