chore: bump docker/build-push-action from 6 to 7

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6 to 7.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v6...v7)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/image-push-master.yaml

@@ -37,7 +37,7 @@ jobs:
           images: ${{ env.IMAGE_NAME }}      
 
       - name: build and push ib-sriov-cni (multi-arch)
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: true

.github/workflows/image-push-release.yaml

@@ -38,7 +38,7 @@ jobs:
             type=ref,event=tag
 
       - name: build and push ib-sriov-cni (multi-arch)
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: true