Bump tzdata from 1.1.4 to 1.2.1

[dependabot]

Bumps tzdata from 1.1.4 to 1.2.1.

Changelog

Sourced from tzdata's changelog.

[1.2.1] - 2026-09-15

Fixed

• Fix a compile error on Erlang/OTP 28+ caused by regexes compiled into module attributes in the leap seconds parser. (Thijs Klaver)

[1.2.0] - 2026-09-13

Added

• Parse the IANA factory source file, adding the placeholder Factory zone (previously omitted) to the zone list.

Changed

• Now requires Elixir 1.12 or greater instead of 1.9 or greater.
• Hackney is no longer a mandatory dependency. When :http_client isn't configured explicitly, Tzdata now automatically picks the best available HTTP client: the built-in :httpc, verifying certificates via :public_key.cacerts_get/0 (the OS-trusted CA bundle), when that's usable (Erlang/OTP 25+); otherwise Hackney, if it's present as a dependency; otherwise :httpc is still used but automatic updates are skipped with a warning rather than downloading without verification. See the README's "HTTP client and security" section for details.
• Debug log messages for downloading new data now include the name of the HTTP client in use (e.g. httpc or hackney).
• tzdata release version shipped with this library is now 2026d instead of 2026c.

Deprecated

• Hackney support is deprecated and will be removed in a future release. Using Tzdata.HTTPClient.Hackney now logs a warning. It is strongly recommended to use Erlang/OTP 25 or higher, where the built-in :httpc client is used by default and no HTTP client dependency is needed.

Fixed

• Fix incorrect or spurious historical time zone periods (wrong or blank abbreviations before a zone's earliest rule, and redundant zero-effect periods at zone-line boundaries) affecting many zones, including America/Regina, America/Chicago, America/Edmonton, America/Inuvik, Antarctica/Troll, America/Chihuahua, America/Argentina/Buenos_Aires, Europe/Dublin, Europe/Vienna, Europe/Istanbul, and most former Soviet zones.

[1.1.5] - 2026-09-06

Fixed

• Fix Africa/Casablanca and Africa/El_Aaiun switching to permanent UTC six months early in tzdata 2026c, and similar errors in some historical transitions, caused by a zone line whose rules end before the line does.

Changed

... (truncated)

Commits

• 47f6dad Release 1.2.1 (#189)
• 58cfd92 Changelog entry
• b5652c8 CI errors on warnings and formatting. Test warning capture. (#188)
• 52dfac5 Formatting
• b5fa73a Move regexes out of module attributes to fix compatibility with OTP 28 (#159)
• 13a96b8 Changes for release 1.2.0 (#187)
• 8a13e8e Update 2026d.v2.ets to include factory
• fa9451b Apply Elixir formatting
• 6a49478 Make .formatter.exs normal
• 0b1ffd0 Add Factory zone (#186)
• Additional commits viewable in compare view

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