Bump puma from 6.4.2 to 6.4.3

Bumps [puma](https://github.com/puma/puma) from 6.4.2 to 6.4.3.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v6.4.2...v6.4.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -29,7 +29,7 @@ GEM
       bson (>= 4.14.1, < 5.0.0)
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
-    nio4r (2.7.0)
+    nio4r (2.7.3)
     parallel (1.24.0)
     parser (3.2.2.4)
       ast (~> 2.4.1)
@@ -41,7 +41,7 @@ GEM
       byebug (~> 11.0)
       pry (>= 0.13, < 0.15)
     public_suffix (5.0.4)
-    puma (6.4.2)
+    puma (6.4.3)
       nio4r (~> 2.0)
     racc (1.7.3)
     rack (2.2.8.1)