pgsql: Update time zone data files to tzdata release 2019c.

Update time zone data files to tzdata release 2019c.

DST law changes in Fiji and Norfolk Island. Historical corrections
for Alberta, Austria, Belgium, British Columbia, Cambodia, Hong Kong,
Indiana (Perry County), Kaliningrad, Kentucky, Michigan, Norfolk
Island, South Korea, and Turkey.

Branch
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REL9_6_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/0bd64398ea28d883f44d4c2d8f689ff441af9949

Modified Files
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src/timezone/data/tzdata.zi | 100 +++++++++++++++++++----------------------
src/timezone/known_abbrevs.txt | 1 +
2 files changed, 46 insertions(+), 55 deletions(-)