Update copyright year to 2023.

* NOTICE,
* subversion/libsvn_subr/version.c (svn_version_extended):
    Bump copyright year to 2023.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1914220 13f79535-47bb-0310-9956-ffa450edef68
2 files changed