Bump puma from 3.12.2 to 3.12.3

Bumps [puma](https://github.com/puma/puma) from 3.12.2 to 3.12.3.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v3.12.2...v3.12.3)

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

Gemfile.lock

@@ -129,7 +129,7 @@ GEM
     pg (1.1.4)
     pg (1.1.4-x64-mingw32)
     pg (1.1.4-x86-mingw32)
-    puma (3.12.2)
+    puma (3.12.3)
     rack (2.0.8)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)