Bump docker/build-push-action to 6.9.0 (#30)

Author: dependabot[bot]

.github/workflows/build-ci.yml

@@ -34,7 +34,7 @@ jobs:
             type=schedule,pattern={{date 'YYYY-MM-DD'}}
             type=raw,value=latest,enable={{is_default_branch}}
       - name: Build and push Docker image
-        uses: docker/build-push-action@5176d81f87c23d6fc96624dfdbcd9f3830bbe445  # v6.5.0
+        uses: docker/build-push-action@4f58ea79222b3b9dc2c8bbdd6debcef730109a75  # v6.9.0
         with:
           context: ci
           platforms: linux/amd64,linux/arm64

.github/workflows/build.yml

@@ -40,7 +40,7 @@ jobs:
             ghcr.io/sphinx-doc/${{ matrix.name }}
           tags: type=pep440,pattern={{version}}
       - name: Build and push Docker image
-        uses: docker/build-push-action@5176d81f87c23d6fc96624dfdbcd9f3830bbe445  # v6.5.0
+        uses: docker/build-push-action@4f58ea79222b3b9dc2c8bbdd6debcef730109a75  # v6.9.0
         with:
           context: ${{ matrix.context }}
           platforms: linux/amd64,linux/arm64