release 2023-07-01
Clean up some StringPiece-related cruft. Change-Id: I6bf7ccda2b0a80b782f3fb3fe05ba79f77082e22 Reviewed-on: https://code-review.googlesource.com/c/re2/+/61490 Reviewed-by: Alex Chernyakhovsky <achernya@google.com> Reviewed-by: Paul Wankadia <junyer@google.com>