Version bump to 2.218.1

[joshdholtz]

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Changes since release '2.218.0':

• [sigh] prevent crashes in fetch_profiles when profiles have no bundle_id ([sigh] prevent crashes in fetch_profiles when profiles have no bundle_id #21758) via jonas2808 (@jonas2808)
• [ci] fix homebrew bump url ([ci] fix homebrew bump url #21761) via Josh Holtz (@joshdholtz)
• [scan] Fix device selection issue fallback scenario ([scan] Fix device selection issue fallback scenario #21772) via arc-v2 (@arc-v2)
• [sigh] fix cache parameters validation ([sigh] fix cache parameters validation #21766) via Vitalii Budnik (@nekrich)
• [match] fix cache issues in read-only mode ([match] fix cache issues in read-only mode #21767) via Vitalii Budnik (@nekrich)

[nekrich]

@joshdholtz , thank you for the quick patch release ❤️.

[joshdholtz]

Closing because there are actually issues with Ruby 2.6 and google-cloud-env 🤦‍♂️ Making fixes and then trying another release