Bump connection_pool from 2.2.3 to 2.3.0

[dependabot[bot]]

Bumps connection_pool from 2.2.3 to 2.3.0.

Changelog

Sourced from connection_pool's changelog.

2.3.0

• Minimum Ruby version is now 2.5.0
• Add pool size to TimeoutError message

2.2.5

• Fix argument forwarding on Ruby 2.7 #149

2.2.4

• Add reload to close all connections, recreating them afterwards [Andrew Marshall, #140]
• Add then as a way to use a pool or a bare connection with the same code path #138

Commits

• a4abba7 release
• ac46d5d Add more context to timeout error
• a105ff6 simplify flaky test
• 67363c6 fix jruby?
• 597adbe remove 2.4
• 87ce172 Cleanup readme
• b9535fa Bump ruby to 2.5+
• 2c92774 integrate standard
• d2ff737 Bump actions/checkout from 2 to 3 (#163)
• eb3b2e0 Add Dependabot for GitHub Actions (#162)
• Additional commits viewable in compare view

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