Bump connection_pool from 2.2.2 to 2.2.3

Bumps connection_pool from 2.2.2 to 2.2.3.

Changelog

Sourced from connection_pool's changelog.

2.2.3

• Pool now throws ConnectionPool::TimeoutError on timeout. #130
• Use monotonic clock present in all modern Rubies [Tero Tasanen, #109]
• Remove code hacks necessary for JRuby 1.7
• Expose wrapped pool from ConnectionPool::Wrapper [Thomas Lecavelier, #113]

Commits

• 8b830d2 Rejigger to remove errors.rb
• 35a8891 Integrate standard gem, code formatting fixes, no functional changes
• f93e357 Move wrapper into separate file
• dd5dac5 Rejigger exceptions, fixes #130
• c46a347 CI: Use openjdk11
• bd71bd4 CI: refer to JRuby using rvm alias
• a8336b4 CI: Run latest JRuby release
• 9c15ab6 README: Use API Redis.new in example
• 8671abd Removed explicitly declaration of thread library.
• 22592e2 Add ruby 2.7 to CI
• Additional commits viewable in compare view