Fix regex syntax in matching os-release (#38010)

From
https://github.com/zed-industries/zed/pull/37712#issuecomment-3281970712,
thank you @zywo

Release Notes:

- N/A
46aa05e240Martin Pool committed on 9/11/2025, 6:22:55 PM· committed by GitHubparenta33af4e
1 file changedLine totals unavailable