Bump mysql2 from 0.5.2 to 0.5.3

Bumps [mysql2](https://github.com/brianmario/mysql2) from 0.5.2 to 0.5.3.
- [Release notes](https://github.com/brianmario/mysql2/releases)
- [Commits](brianmario/mysql2@0.5.2...0.5.3)

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

Author: dependabot-preview[bot]

Gemfile

@@ -65,7 +65,7 @@ gem 'cf-perm', '~> 0.0.10'
 gem 'scientist', '~> 1.1.0'
 
 group :db do
-  gem 'mysql2', '~> 0.5.0'
+  gem 'mysql2', '~> 0.5.3'
   gem 'pg'
 end
 

Gemfile.lock

@@ -289,7 +289,7 @@ GEM
     mustache (1.1.1)
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
-    mysql2 (0.5.2)
+    mysql2 (0.5.3)
     net-ssh (6.1.0)
     netaddr (2.0.4)
     netrc (0.11.0)
@@ -530,7 +530,7 @@ DEPENDENCIES
   mime-types (~> 3.3)
   multi_json
   multipart-parser
-  mysql2 (~> 0.5.0)
+  mysql2 (~> 0.5.3)
   net-ssh
   netaddr (>= 2.0.4)
   newrelic_rpm