Bump puma from 6.4.2 to 6.4.3 in the bundler group (#1039)

Bumps the bundler group with 1 update: [puma](https://github.com/puma/puma).

Updates `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
  dependency-group: bundler
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile

@@ -8,7 +8,7 @@ gem 'rails', '~> 6.1'
 gem 'pg'
 # gem 'pg', '1.1.4',  platforms: [:mingw, :x64_mingw]
 # Use Puma as the app server
-gem 'puma', '~> 6.4.2'
+gem 'puma', '~> 6.4.3'
 gem 'terser'
 # See https://github.com/rails/execjs#readme for more supported runtimes