CI/CD

Add Christmas Island holidays #8219

Job	Run time
Run pre-commit	29s
CodeQL	1m 28s
Test Python 3.9 on macos-latest	1m 7s
Test Python 3.10 on macos-latest	1m 19s
Test Python 3.12 on macos-latest	48s
Test Python 3.10 on ubuntu-latest	1m 18s
Test Python 3.11 on macos-latest	51s
Test Python 3.13 on macos-latest	54s
Test Python 3.9 on ubuntu-latest	1m 18s
Test Python 3.11 on ubuntu-latest	1m 17s
Test Python 3.12 on ubuntu-latest	1m 24s
Test Python 3.9 on windows-latest	2m 45s
Test Python 3.13 on windows-latest	3m 29s
Test Python 3.10 on windows-latest	2m 38s
Test Python 3.11 on windows-latest	2m 54s
Test Python 3.12 on windows-latest	2m 40s
Test Python 3.13 on ubuntu-latest	1m 43s
Test docs build	25s
Build distribution	27s
Test build on ubuntu-latest	1m 3s
Test build on macos-latest	41s
Test build on windows-latest	4m 10s
Create SHA1 checksums and Sigstore signatures	0s
Publish generated artifacts	0s
Update GitHub release with SBOM and signed artifacts	0s
	35m 8s

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