Bump puma from 3.11.4 to 4.3.12

Bumps [puma](https://github.com/puma/puma) from 3.11.4 to 4.3.12.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v3.11.4...v4.3.12)

---
updated-dependencies:
- dependency-name: puma
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -1,7 +1,9 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    puma (3.11.4)
+    nio4r (2.5.8)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     rack (2.0.6)
     rack-contrib (2.1.0)
       rack (~> 2.0)