Just bumping the version and moving some recent userdef theme changes into a version-specific block. Will fix the issue that changes to custom face orientation color does not save, and related issues for recently-added theme entries.

Also updating the comment for the "Next version" section of versioning_userdef.c:

/* Versioning code until next subversion bump goes here.
     * Note: be sure to check "versioning_{BLENDER_VERSION}.c" when bumping the version.
     * Note: keep this message at the bottom of the function. */

Will commit without further review soon.