Bump docker/build-push-action from 4.1.1 to 4.2.1 (#1044)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 4.1.1 to 4.2.1.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@2eb1c19...0a97817)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/ci.yml

@@ -197,7 +197,7 @@ jobs:
             type=ref,event=branch,suffix=-rc,enable=${{ startsWith(github.ref, 'refs/heads/release') }}
 
       - name: Build NKG Docker Image
-        uses: docker/build-push-action@2eb1c1961a95fc15694676618e422e8ba1d63825 # v4.1.1
+        uses: docker/build-push-action@0a97817b6ade9f46837855d676c4cca3a2471fc9 # v4.2.1
         with:
           file: build/Dockerfile
           tags: ${{ steps.nkg-meta.outputs.tags }}
@@ -209,7 +209,7 @@ jobs:
           pull: true
 
       - name: Build NGINX Docker Image
-        uses: docker/build-push-action@2eb1c1961a95fc15694676618e422e8ba1d63825 # v4.1.1
+        uses: docker/build-push-action@0a97817b6ade9f46837855d676c4cca3a2471fc9 # v4.2.1
         with:
           file: build/Dockerfile.nginx
           tags: ${{ steps.nginx-meta.outputs.tags }}
@@ -300,7 +300,7 @@ jobs:
             type=ref,event=branch,suffix=-rc,enable=${{ startsWith(github.ref, 'refs/heads/release') }}
 
       - name: Build Docker Image
-        uses: docker/build-push-action@2eb1c1961a95fc15694676618e422e8ba1d63825 # v4.1.1
+        uses: docker/build-push-action@0a97817b6ade9f46837855d676c4cca3a2471fc9 # v4.2.1
         with:
           file: ${{ matrix.container == 'nginx' && 'build/Dockerfile.nginx' || 'build/Dockerfile' }}
           context: "."

.github/workflows/conformance.yml

@@ -87,7 +87,7 @@ jobs:
           args: build --snapshot --clean
 
       - name: Build NKG Docker Image
-        uses: docker/build-push-action@2eb1c1961a95fc15694676618e422e8ba1d63825 # v4.1.1
+        uses: docker/build-push-action@0a97817b6ade9f46837855d676c4cca3a2471fc9 # v4.2.1
         with:
           file: build/Dockerfile
           tags: ${{ steps.nkg-meta.outputs.tags }}
@@ -99,7 +99,7 @@ jobs:
           pull: true
 
       - name: Build NGINX Docker Image
-        uses: docker/build-push-action@2eb1c1961a95fc15694676618e422e8ba1d63825 # v4.1.1
+        uses: docker/build-push-action@0a97817b6ade9f46837855d676c4cca3a2471fc9 # v4.2.1
         with:
           file: build/Dockerfile.nginx
           tags: ${{ steps.nginx-meta.outputs.tags }}
@@ -118,7 +118,7 @@ jobs:
         working-directory: ./conformance
 
       - name: Build Test Docker Image
-        uses: docker/build-push-action@2eb1c1961a95fc15694676618e422e8ba1d63825 # v4.1.1
+        uses: docker/build-push-action@0a97817b6ade9f46837855d676c4cca3a2471fc9 # v4.2.1
         with:
           file: conformance/tests/Dockerfile
           tags: conformance-test-runner:${{ github.sha }}