Bump pghero from 2.4.1 to 2.4.2 (#13603)

Bumps [pghero](https://github.com/ankane/pghero) from 2.4.1 to 2.4.2.
- [Release notes](https://github.com/ankane/pghero/releases)
- [Changelog](https://github.com/ankane/pghero/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ankane/pghero/compare/v2.4.1...v2.4.2)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile.lock

@@ -414,7 +414,7 @@ GEM
       equatable (~> 0.6)
       tty-color (~> 0.5)
     pg (1.2.3)
-    pghero (2.4.1)
+    pghero (2.4.2)
       activerecord (>= 5)
     pkg-config (1.4.1)
     premailer (1.11.1)