Bump docker/build-push-action from 6.12.0 to 6.15.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.12.0 to 6.15.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@67a2d40...471d1dc)

---
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>

Author: dependabot[bot]

.github/workflows/docker-image.yml

@@ -45,7 +45,7 @@ jobs:
           password: ${{ secrets.MILVUSDB_DOCKER_PWD }}
       - name: Build and push by digest
         id: build
-        uses: docker/build-push-action@67a2d409c0a876cbe6b11854e3e25193efe4e62d # v6.12.0
+        uses: docker/build-push-action@471d1dc4e07e5cdedd4c2171150001c434f0b7a4 # v6.15.0
         with:
           context: .
           platforms: ${{ matrix.platform }}

.github/workflows/tool-docker-image.yml

@@ -45,7 +45,7 @@ jobs:
           password: ${{ secrets.MILVUSDB_DOCKER_PWD }}
       - name: Build and push by digest
         id: build
-        uses: docker/build-push-action@67a2d409c0a876cbe6b11854e3e25193efe4e62d # v6.12.0
+        uses: docker/build-push-action@471d1dc4e07e5cdedd4c2171150001c434f0b7a4 # v6.15.0
         with:
           context: .
           file: ./tool.Dockerfile