Bump puma from 5.6.2 to 5.6.4

Bumps [puma](https://github.com/puma/puma) from 5.6.2 to 5.6.4.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v5.6.2...v5.6.4)

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

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

Author: dependabot[bot]

Gemfile

@@ -7,7 +7,7 @@ end
 
 gem("bcrypt", "~> 3.1.7")
 gem("jwt", "~> 2.1.0")
-gem("puma", "~> 5.6.2")
+gem("puma", "~> 5.6.4")
 gem("rails", "~> 5.2.3")
 gem("rubocop")
 gem("sqlite3")

Gemfile.lock

@@ -82,7 +82,7 @@ GEM
     parallel (1.21.0)
     parser (3.1.1.0)
       ast (~> 2.4.1)
-    puma (5.6.2)
+    puma (5.6.4)
       nio4r (~> 2.0)
     racc (1.6.0)
     rack (2.2.3)
@@ -190,7 +190,7 @@ DEPENDENCIES
   database_cleaner
   jwt (~> 2.1.0)
   listen (~> 3.2.0)
-  puma (~> 5.6.2)
+  puma (~> 5.6.4)
   rails (~> 5.2.3)
   rspec
   rspec-mocks