Drop `manylinux2014` from the build matrix.

Bumping to `actions/checkout@v4` broke it because it can't run the Node
20 binary. Its EOL is still a few months away, apparently, but updating
to Node 20 probably can't wait that long. C'est la vie.

Change-Id: Icf2bbd676583352f323cdac3056b4c8bebbbb07d
Reviewed-on: https://code-review.googlesource.com/c/re2/+/62511
Reviewed-by: Alex Chernyakhovsky <achernya@google.com>
Reviewed-by: Paul Wankadia <junyer@google.com>
1 file changed