CI/CD

add function to get the next holiday #5429

Job	Run time
Run pre-commit	33s
CodeQL	1m 15s
Test Python 3.9 on macos-latest	54s
Test Python 3.10 on macos-latest	56s
Test Python 3.11 on macos-latest	50s
Test Python 3.12 on macos-latest	45s
Test Python 3.13 on macos-latest	52s
Test Python 3.9 on ubuntu-latest	1m 5s
Test Python 3.10 on ubuntu-latest	1m 7s
Test Python 3.11 on ubuntu-latest	52s
Test Python 3.12 on ubuntu-latest	1m 15s
Test Python 3.13 on ubuntu-latest	1m 9s
Test Python 3.9 on windows-latest	1m 48s
Test Python 3.10 on windows-latest	1m 57s
Test Python 3.11 on windows-latest	2m 4s
Test Python 3.12 on windows-latest	2m 5s
Test Python 3.13 on windows-latest	2m 13s
Test docs build	37s
Build distribution	20s
Test build on macos-latest	26s
Test build on ubuntu-latest	59s
Test build on windows-latest	2m 53s
Publish generated artifacts	0s
Create SHA1 checksums and Sigstore signatures	0s
Update GitHub release with SBOM and signed artifacts	0s
	26m 55s

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