Self-Hosted Runners compatibility change isn't updated to documentation

[chickenandpork]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/actions/hosting-your-own-runners/managing-self-hosted-runners/about-self-hosted-runners#macos

What changes are you suggesting?

Reflect the minimum MacOS version in accordance with node20 minimum requirements as reflected in actions/runner#2879 to promote values in https://github.com/nodejs/node/blob/main/BUILDING.md#platform-list to top-level of GitHub doc

Additional information

I have a one-liner patch ready.

[welcome]

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[cmwilson21]

@chickenandpork Thank you for opening an issue and linking it to your PR! ✨