CI/CD

Add United Kingdom's Whit Monday holidays for pre-1971 years #3540

Job	Run time
Run pre-commit	34s
Test Python 3.8 on macOS-latest	1m 24s
Test Python 3.9 on macOS-latest	1m 55s
Test Python 3.10 on macOS-latest	4m 1s
Test Python 3.11 on macOS-latest	2m 12s
Test Python 3.12 on macOS-latest	1m 45s
Test Python pypy-3.9 on macOS-latest	2m 55s
Test Python pypy-3.10 on macOS-latest	2m 25s
Test Python 3.8 on ubuntu-latest	48s
Test Python 3.9 on ubuntu-latest	48s
Test Python 3.10 on ubuntu-latest	49s
Test Python 3.11 on ubuntu-latest	54s
Test Python 3.12 on ubuntu-latest	59s
Test Python pypy-3.9 on ubuntu-latest	2m 22s
Test Python pypy-3.10 on ubuntu-latest	2m 21s
Test Python 3.8 on windows-latest	1m 17s
Test Python 3.9 on windows-latest	1m 16s
Test Python 3.10 on windows-latest	1m 15s
Test Python 3.11 on windows-latest	1m 39s
Test Python 3.12 on windows-latest	1m 18s
Test Python pypy-3.9 on windows-latest	4m 42s
Test Python pypy-3.10 on windows-latest	4m 28s
Finish coveralls	4s
Build distribution	25s
Publish to PyPI	0s
	42m 36s

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