Bump puma from 3.12.3 to 3.12.4

Bumps [puma](https://github.com/puma/puma) from 3.12.3 to 3.12.4.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v3.12.3...v3.12.4)

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

Author: dependabot[bot]

Gemfile.lock

@@ -128,7 +128,7 @@ GEM
       mimemagic (~> 0.3.0)
       terrapin (~> 0.6.0)
     public_suffix (4.0.3)
-    puma (3.12.3)
+    puma (3.12.4)
     rack (2.1.2)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)