chore(deps-dev): bump puma from 4.3.5 to 4.3.9 (#677)

Bumps [puma](https://github.com/puma/puma) from 4.3.5 to 4.3.9.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](https://github.com/puma/puma/compare/v4.3.5...v4.3.9)

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

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

Gemfile.lock

@@ -101,7 +101,7 @@ GEM
       net-ssh (>= 2.6.5, < 6.0.0)
     net-ssh (5.2.0)
     newrelic_rpm (7.0.0)
-    nio4r (2.5.2)
+    nio4r (2.5.8)
     nokogiri (1.11.1)
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
@@ -111,7 +111,7 @@ GEM
       racc (~> 1.4)
     non-stupid-digest-assets (1.0.9)
       sprockets (>= 2.0)
-    puma (4.3.5)
+    puma (4.3.9)
       nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)