chore(deps): bump docker/build-push-action from 5 to 6 (#8769)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 5 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v5...v6)

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

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

.github/workflows/pythonpackage.yml

@@ -158,7 +158,7 @@ jobs:
         with:
           config: /tmp/buildkitd.toml
       - name: Test Docker Build
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           platforms: linux/amd64
           push: false
@@ -212,7 +212,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
       - if: success()
         name: Build and Push
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           platforms: ${{ env.TARGET_PLATFORMS }}
           push: ${{ github.event_name != 'pull_request' && !env.ACT }}
@@ -227,7 +227,7 @@ jobs:
             security.insecure
       - if: success()
         name: Snag wheels
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           file: Dockerfile
           platforms: ${{ env.TARGET_PLATFORMS }}