bpo-39460: Fix test_zipfile.test_add_file_after_2107() (GH-18247)

XFS filesystem is limited to 32-bit timestamp, but the utimensat()
syscall doesn't fail. Moreover, there is a VFS bug which returns
a cached timestamp which is different than the value on disk.

https://bugzilla.redhat.com/show_bug.cgi?id=1795576
https://bugs.python.org/issue39460#msg360952