Bump puma from 3.11.4 to 3.12.0

Bumps [puma](https://github.com/puma/puma) from 3.11.4 to 3.12.0.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v3.11.4...v3.12.0)

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

Gemfile.lock

@@ -225,7 +225,7 @@ GEM
     pghero (2.1.1)
       activerecord
     public_suffix (3.0.2)
-    puma (3.11.4)
+    puma (3.12.0)
     rack (2.0.5)
     rack-accept-default (0.0.2)
       rack