Add Congo holidays #4877

Job	Run time
Run pre-commit	33s
CodeQL	2m 6s
Test Python 3.8 on macos-latest	1m 13s
Test Python 3.9 on macos-latest	42s
Test Python 3.10 on macos-latest	41s
Test Python 3.11 on macos-latest	37s
Test Python 3.12 on macos-latest	59s
Test Python 3.13 on macos-latest	1m 11s
Test Python 3.8 on ubuntu-latest	58s
Test Python 3.9 on ubuntu-latest	55s
Test Python 3.10 on ubuntu-latest	1m 6s
Test Python 3.11 on ubuntu-latest	54s
Test Python 3.12 on ubuntu-latest	1m 36s
Test Python 3.13 on ubuntu-latest	1m 14s
Test Python 3.8 on windows-latest	1m 53s
Test Python 3.9 on windows-latest	1m 47s
Test Python 3.10 on windows-latest	1m 43s
Test Python 3.11 on windows-latest	1m 37s
Test Python 3.12 on windows-latest	2m 54s
Test Python 3.13 on windows-latest	2m 16s
Build distribution	32s
Test docs build	35s
Test build on macos-latest	57s
Test build on ubuntu-latest	1m 2s
Test build on windows-latest	2m 22s
Publish generated artifacts	0s
	32m 23s

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