deps(actions): bump docker/build-push-action from 6.18.0 to 7.0.0 (llm-d-incubation#326)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.18.0 to 7.0.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@2634353...d08e5c3)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: 7.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build-launcher-image.yml

@@ -92,7 +92,7 @@ jobs:
 
       - name: Build & Push (official action)
         id: build-and-push
-        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
+        uses: docker/build-push-action@d08e5c354a6adb9ed34480a06d141179aa583294 # v7.0.0
         with:
           context: .
           file: ./dockerfiles/Dockerfile.launcher.benchmark

.github/workflows/build-requester-image.yml

@@ -70,7 +70,7 @@ jobs:
 
       - name: Build & Push (official action)
         id: build-and-push
-        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
+        uses: docker/build-push-action@d08e5c354a6adb9ed34480a06d141179aa583294 # v7.0.0
         with:
           context: .
           file: ./dockerfiles/Dockerfile.requester