Update tzdata to version 2026f (#157)
Version 2026.6
Upstream version 2026f released 2026-10-28T06:16:49+00:00
Briefly:
Cuba will not fall back 2026-11-01; stays on -04 through 2027-11-07. No more
leap seconds, and leap second tables no longer expire. Improve 1965/1966 data
for Brazil.
Changes to future timestamps
Cuba will not fall back to -05 on 2026-11-01 and instead plans to maintain -04
through 2027-11-07.
Changes to past timestamps
In 1965 Brazil ended DST on 03-31 at 24:00 not 00:00, and in 1966 it ended DST
on 03-01 at 01:00 not 00:00.  (Thanks to Daniel Dias Rodrigues.)
Changes to documentation and commentary
Documentation and commentary now reflect leap seconds’ demise.
Changes to commentary
Discussion on timekeeping in northwestern Ontario has been updated to reflect
that provincial regulation has been issued to allow these areas to stay aligned
with America/Winnipeg and follow Manitoba’s adoption of year-round -05 after
all.  (Thanks to Aoun Khan, Chris Walton, and Heitor David Pinto.)
Discussion on timekeeping in Saskatchewan has been updated to document its new
Time Act, 2026 which comes into force on 2026-10-30.  (Thanks to Heitor David
Pinto.)  No change is expected.
Co-authored-by: Stan Ulbrych stan@python.org