Update dependency holidays to v9

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
holidays (changelog)	8.8.0 → 9.2.0

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Release Notes

holidays/holidays (holidays)

v9.2.0

• Update to v6.1.1 definitions. Please see the changelog for the definition details.
• Add test:contract rake task and make test-contract target combining smoke and generated definition tests for use as a downstream contract check
• Set coverage minimum to 90% and skip for ruby-head builds

v9.1.2

• Fix bug (#​344) where holidays with the same name and function but different implementations across regions would return incorrect results depending on region load order. When multiple regions are queried simultaneously, each region's function implementation is now evaluated independently and all matching results are returned.

v9.1.1

• Update to v6.0.1 definitions. Please see the changelog for the definition details.

v9.1.0

• Update to v6.0.0 definitions. Please see the changelog for the definition details.
• Update mocha from 1.x to 2.x for Ruby 4.0 compatibility. Fixes warning about removed CGI library.

v9.0.0

Compare Source

• Drop support for Ruby < 3.2. Supported versions are now 3.2, 3.3, 3.4, and ruby-head.
• Update to v5.9.0 definitions. Please see the changelog for the definition details.

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Code Coverage Report: Only Changed Files listed

Package	Base Coverage	New Coverage	Difference
Overall Coverage	🟢 53.1%	🟢 53.1%	⚪ 0%

Minimum allowed coverage is 0%, this run produced 53.1%