Update dependency holidays to v11.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
holidays (changelog)	11.5.0 → 11.6.0

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Release Notes

holidays/holidays (holidays)

v11.6.0

Compare Source

• Update to v9.1.0 definitions: tr feast dates calculated instead of table-driven, vn Giỗ Tổ Hùng Vương date fixes, and a region-aware us Independence Day observed shift.
• Calculate tr Ramazan Bayramı and Kurban Bayramı from a Hijri calendar instead of a hand-maintained per-year table, so they no longer silently disappear past 2030. #​504
• Fix vn Giỗ Tổ Hùng Vương dates for 2018-2023, caused by a lunar calendar leap-month bug in the 2017 table row. #​506
• Add a region-aware independence_day observed method for us Independence Day, replacing the us_va-only shift. Most regions shift to the nearest weekday, us_ri shifts to the following Monday, and us_tx never shifts. #​508

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Code Coverage Report: Only Changed Files listed

Package	Base Coverage	New Coverage	Difference
Overall Coverage	🟢 58.36%	🟢 58.36%	⚪ 0%

Minimum allowed coverage is 0%, this run produced 58.36%