Bump puma from 3.9.1 to 4.3.2

Bumps [puma](https://github.com/puma/puma) from 3.9.1 to 4.3.2.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v3.9.1...v4.3.2)

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

Gemfile.lock

@@ -186,6 +186,7 @@ GEM
     multi_xml (0.6.0)
     multipart-post (2.0.0)
     nenv (0.3.0)
+    nio4r (2.5.2)
     notiffany (0.1.1)
       nenv (~> 0.1)
       shellany (~> 0.0)
@@ -224,7 +225,8 @@ GEM
       pry (~> 0.10)
     pry-nav (0.2.4)
       pry (>= 0.9.10, < 0.11.0)
-    puma (3.9.1)
+    puma (4.3.2)
+      nio4r (~> 2.0)
     rack (1.6.8)
     rack-accept (0.4.5)
       rack (>= 0.4)