pgsql: Update time zone data files to tzdata release 2023c.

Update time zone data files to tzdata release 2023c.

DST law changes in Egypt, Greenland, Morocco, and Palestine.

When observing Moscow time, Europe/Kirov and Europe/Volgograd now
use the abbreviations MSK/MSD instead of numeric abbreviations,
for consistency with other timezones observing Moscow time.

Also, America/Yellowknife is no longer distinct from America/Edmonton;
this affects some pre-1948 timestamps in that area.

Branch
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REL_13_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/87d8ec3e47e4da80ede7765d03a5d7433f8811d6

Modified Files
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src/timezone/data/tzdata.zi | 132 ++++++++++++++++++++++++++++++++---------
src/timezone/known_abbrevs.txt | 3 +-
2 files changed, 106 insertions(+), 29 deletions(-)