Update sentry-ruby monorepo to v5.18.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
sentry-rails (changelog)	5.18.0 -> 5.18.1
sentry-ruby (changelog)	5.18.0 -> 5.18.1

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Release Notes

getsentry/sentry-ruby (sentry-rails)

### [`v5.18.1`](https://togithub.com/getsentry/sentry-ruby/blob/HEAD/CHANGELOG.md#5181) [Compare Source](https://togithub.com/getsentry/sentry-ruby/compare/5.18.0...5.18.1) ##### Bug Fixes - Drop `Gem::Specification`'s usage so it doesn't break bundler standalone ([#​2335](https://togithub.com/getsentry/sentry-ruby/pull/2335))

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Configuration

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🚦 Automerge: Enabled.

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[github-actions[bot]]

Code Coverage Report: Only Changed Files listed

Package	Coverage
Overall Coverage	🟢 85%

Minimum allowed coverage is 0%, this run produced 85%