Update ciso8601 requirement from >=2.1 to >=2.3.3 in /extra

[dependabot]

Updates the requirements on ciso8601 to permit the latest version.

Release notes

Sourced from ciso8601's releases.

v2.3.3

Version 2.3.3

• Added Python 3.14 support
• Added PyPy 3.11 support
• Fixed memory leak in FixedOffset_fromutc (#172).
• Migrated some CI testing to GHA

Changelog

Sourced from ciso8601's changelog.

Version 2.3.3

• Added Python 3.14 support
• Added PyPy 3.11 support
• Fixed memory leak in FixedOffset_fromutc (#172).
• Migrated some CI testing to GHA

Version 2.3.2

• Add support for aarch64 wheels. Thank you @​bbayles!
• Add wheels for PyPy 3.10
• Added Python 3.13 support
• Better error message when attempting to parse a BCE year (#156). Thanks @​javiabellan

Version 2.3.1

• Added Python 3.12 wheels

Version 2.3.0

• Added Python 3.11 support
• Fix the build for PyPy2 (#116)
• Added missing fromutc implementation for FixedOffset (#113). Thanks @​davidkraljic
• Removed improper ability to call FixedOffset's dst, tzname and utcoffset without arguments
• Fixed: datetime.tzname returns a str in Python 2.7, not a unicode
• Change METH_VARARGS to METH_O, enhancing performance. (#130)
• Added support for ISO week dates, (#139)
• Added support for ordinal dates, (#140)

Version 2.2.0

• Added Python 3.9 support
• Switched to using a C implementation of timezone objects.
  • Much faster parse times for timestamps with timezone information
    • ~2.5x faster on Python 2.7, ~10% faster on Python 3.9
  • Thanks to pendulum and @​sdispater for the code.
  • Python 2.7 users no longer need to install pytz dependency 😃
• Added caching of tzinfo objects
  • Parsing is ~1.1x faster for subsequent timestamps that have the same time zone offset.
  • Caching can be disabled at compile time by setting the CISO8601_CACHING_ENABLED=0 environment variable
• Fixed a memory leak in the case where an invalid timestamp had a non-UTC timezone and extra characters

Version 2.1.3

• Fixed a problem where non-ASCII characters would give bad error messages (#84). Thanks @​olliemath.

Version 2.1.2

• Fixed a problem where ciso8601.__version__ was not working (#80). Thanks @​ianhoffman.
• Added Python 3.8 support (#83)

... (truncated)

Commits

• 67a644a Release 2.3.3 (#171)
• 0f780ae Fix memory leak in FixedOffset_fromutc (#172)
• 663d905 Test and benchmark 3.14, migrate some CI configs (#170)
• ad21983 Build additional wheels on upgraded cibuildwheel (#169)
• c2217de fix pypy compilation error (#168)
• 5509f6f Fix buildwheels and update RELEASE.md instructions (#164)
• 9412b8c Release v2.3.2
• d6d021f Provide better error messages for BCE-year datetimes.
• 40b68f3 Use unittest instead of setuptools
• 4da5e56 Update the benchmarks for 3.13
• Additional commits viewable in compare view

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