Add Saint Kitts & Nevis holidays #4760

Job	Run time
Run pre-commit	27s
CodeQL	2m 10s
Test Python 3.8 on macos-latest	1m 17s
Test Python 3.9 on macos-latest	45s
Test Python 3.10 on macos-latest	37s
Test Python 3.11 on macos-latest	48s
Test Python 3.12 on macos-latest	47s
Test Python 3.13 on macos-latest	56s
Test Python 3.8 on ubuntu-latest	1m 0s
Test Python 3.9 on ubuntu-latest	51s
Test Python 3.10 on ubuntu-latest	1m 0s
Test Python 3.11 on ubuntu-latest	53s
Test Python 3.12 on ubuntu-latest	1m 22s
Test Python 3.13 on ubuntu-latest	1m 13s
Test Python 3.8 on windows-latest	1m 33s
Test Python 3.9 on windows-latest	2m 1s
Test Python 3.10 on windows-latest	1m 40s
Test Python 3.11 on windows-latest	1m 44s
Test Python 3.12 on windows-latest	2m 12s
Test Python 3.13 on windows-latest	2m 22s
Test docs build	34s
Build distribution	24s
Test build on macos-latest	28s
Test build on ubuntu-latest	45s
Test build on windows-latest	1m 43s
Publish generated artifacts	0s
	29m 32s

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