Bump docker/build-push-action from 6 to 7 (#421)

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
...

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

Author: dependabot[bot]

.github/workflows/python-dockerimages-cibuildwheel.yml

@@ -40,7 +40,7 @@ jobs:
           echo "ARCH=x86_64" >> $GITHUB_ENV
         if: matrix.os == 'ubuntu-24.04'
       - name: Build and push ${{ matrix.base_image }}-${{ env.ARCH }} docker image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: docker/${{ matrix.base_image }}linux-builder-${{ env.ARCH }}
           build-contexts: scripts=docker/scripts