Update dependency connection_pool to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
connection_pool (changelog)	'< 3' → '< 4'

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Release Notes

mperham/connection_pool (connection_pool)

v3.0.2

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• Support :name keyword for backwards compatibility [#​210]

v3.0.1

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• Add missing fork.rb to gemspec.

v3.0.0

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• BREAKING CHANGES ConnectionPool and ConnectionPool::TimedStack now
  use keyword arguments rather than positional arguments everywhere. Expected impact is minimal as most people use the with API, which is unchanged.

pool = ConnectionPool.new(size: 5, timeout: 5)
pool.checkout(1) # 2.x
pool.reap(30)    # 2.x
pool.checkout(timeout: 1) # 3.x
pool.reap(idle_seconds: 30) # 3.x

• Dropped support for Ruby <3.2.0

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