gha: bump docker/build-push-action from 4.1.1 to 4.2.1 (#2279)
Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 4.1.1 to 4.2.1.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/2eb1c1961a95fc15694676618e422e8ba1d63825...0a97817b6ade9f46837855d676c4cca3a2471fc9)
---
updated-dependencies:
- dependency-name: docker/build-push-action
dependency-type: direct:production
update-type: version-update:semver-minor
...
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