Bump docker/build-push-action from v2.3.0 to v2.4.0
Bump docker/build-push-action from v2.3.0 to v2.4.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from v2.3.0 to v2.4.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v2.3.0...e1b7f96249f2e4c8e4ac1519b9608c0d48944a1f)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
scalameta/scalafmt,scalameta/scalafmt,scalameta/scalafmt,scalameta/scalafmt