Update to 6.92

Upstream changes:
6.92  2023-06-07
  -  Time zone fixes
        Newest zoneinfo data (tzdata 2023c).

  -  Documentation fixes
        Typo fix. Reported by Derek Terveer

6.91  2023-03-01
  -  Fixed bug where timezone alias wasn't handled
        On linux systems configured to be in a timezone that is an alias,
        the system timezone wasn't recognized, and it defaulted to GMT.
        This is now fixed. Patch supplied by Sandi Wallendahl (GitHub #43)

6.90  2022-12-02
  -  Time zone fixes
        Aliases in the tzdata database were not being added to the timezone
        data. Reported in GitHub issue #40.

        The UTC timezone is now named Etc/UTC instead of UTC to be in line
        with the aliases.

        Newest zoneinfo data (tzdata 2022g).

  -  Language fixes
        Additions to the Polish translation. GitHub issue #41.

        Additions to several languages. GitHub issue #42.

        Added some support for per-language parsing rules to respond to
        GitHub issue #42.

  -  Documentation fixes
        The version numbers in the change log was messed up due to a
        skipped release (no new timezone fixes that time). Fixed.

6.89  2022-09-01
  -  (!) Date::Manip 5.xx interface to be removed
        The old version of Date::Manip (version 5.xx) has been distributed
        as part of the package in order to support versions of perl older
        than 5.10 . I see no valid reason to continue to support that, so
        as of version 7.00, Date::Manip will only include the newer
        interfaces (which require perl 5.10 or newer). There are no plans
        to deprecate the functional interface.

  -  Time zone fixes
        Newest zoneinfo data (tzdata 2022c).

(wen)