Update United States holidays: Columbus Day adjustment

[KJhellico]

Proposed change

Columbus Day adjustment:

• Columbus Day with this exact name now exist only in 16 states and the territory of American Samoa
• some states have this holiday as "Indigenous Peoples Day" or other name

Type of change

• New country/market holidays support (thank you!)
• Supported country/market holidays update (calendar discrepancy fix, localization)
• Existing code/documentation/test/process quality improvement (best practice, cleanup, refactoring, optimization)
• Dependency update (version deprecation/upgrade)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (a code change causing existing functionality to break)
• New feature (new python-holidays functionality in general)

Checklist

• I've followed the contributing guidelines
• I've added references to all holidays information sources used in this PR
• The code style looks good: make pre-commit command generates no changes
• All tests pass locally: make test, make tox (we strongly encourage adding tests to your code)

[KJhellico]

@PPsyrius , @hissingpanda, I'd be glad to see your thoughts.

[coveralls]

Pull Request Test Coverage Report for Build 6441311846

• 28 of 28 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 6435590966:	0.0%
Covered Lines:	9560
Relevant Lines:	9560

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💛 - Coveralls

[arkid15r]

👍

Some minor comments:

[PPsyrius]

Update: Seems like Minnesota (MN) just announced the change too yesterday (2023-10-09): https://www.wdio.com/front-page/top-stories/october-9th-is-officially-indigenous-peoples-day-in-minnesota/

[KJhellico]

Update: Seems like Minnesota (MN) just announced the change too yesterday (2023-10-09): https://www.wdio.com/front-page/top-stories/october-9th-is-officially-indigenous-peoples-day-in-minnesota/

As I understand, governor's proclamation is not enough to make it a legal state holiday.

[arkid15r]

LGTM

Please make sure the CA Columbus Day PR doesn't become dangling due to this overhaul.

[KJhellico]

This PR includes changes from #1500 (remove Columbus Day for CA).

[arkid15r]

👍