Add GCC 13 to the build matrix.

... and remove GCC 10 so that we continue to
test with only the three most recent releases.

Change-Id: I84eb4a7fd71c8f8ecc69b5f6a245e102c285f3c8
Reviewed-on: https://code-review.googlesource.com/c/re2/+/61210
Reviewed-by: Alex Chernyakhovsky <achernya@google.com>
Reviewed-by: Paul Wankadia <junyer@google.com>
1 file changed