Policy information:
https://opensource.google/documentation/policies/cplusplus-support#c_language_standard
https://github.com/google/oss-policies-info/blob/main/foundational-cxx-support-matrix.md

PiperOrigin-RevId: 723589409
Change-Id: Ia8665c052ed40f2a78308f7eb0c330191b0cf981