CI/CD

Add Christmas Island holidays #8200

Job	Run time
Run pre-commit	30s
CodeQL	1m 33s
Test Python 3.13 on macos-latest	53s
Test Python 3.11 on macos-latest	52s
Test Python 3.11 on ubuntu-latest	1m 20s
Test Python 3.10 on windows-latest	3m 36s
Test Python 3.9 on macos-latest	1m 8s
Test Python 3.10 on ubuntu-latest	1m 22s
Test Python 3.10 on macos-latest	1m 4s
Test Python 3.12 on macos-latest	1m 1s
Test Python 3.12 on ubuntu-latest	1m 25s
Test Python 3.13 on windows-latest	3m 24s
Test Python 3.13 on ubuntu-latest	1m 36s
Test Python 3.12 on windows-latest	2m 42s
Test Python 3.9 on ubuntu-latest	1m 20s
Test Python 3.9 on windows-latest	3m 7s
Test Python 3.11 on windows-latest	3m 16s
Test docs build	21s
Build distribution	27s
Test build on ubuntu-latest	1m 1s
Test build on macos-latest	36s
Test build on windows-latest	4m 15s
Publish generated artifacts	0s
Create SHA1 checksums and Sigstore signatures	0s
Update GitHub release with SBOM and signed artifacts	0s
	36m 49s

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