CI/CD

Add Sri Lanka holidays #5593

Job	Run time
Run pre-commit	33s
CodeQL	1m 34s
Test Python 3.9 on macos-latest	1m 10s
Test Python 3.10 on macos-latest	1m 7s
Test Python 3.11 on macos-latest	42s
Test Python 3.12 on macos-latest	47s
Test Python 3.13 on macos-latest	45s
Test Python 3.9 on ubuntu-latest	53s
Test Python 3.10 on ubuntu-latest	56s
Test Python 3.11 on ubuntu-latest	51s
Test Python 3.12 on ubuntu-latest	1m 10s
Test Python 3.13 on ubuntu-latest	51s
Test Python 3.9 on windows-latest	1m 57s
Test Python 3.10 on windows-latest	1m 46s
Test Python 3.11 on windows-latest	1m 46s
Test Python 3.12 on windows-latest	2m 26s
Test Python 3.13 on windows-latest	1m 50s
Build distribution	20s
Test docs build	30s
Test build on macos-latest	33s
Test build on ubuntu-latest	41s
Test build on windows-latest	2m 13s
Publish generated artifacts	0s
Create SHA1 checksums and Sigstore signatures	0s
Update GitHub release with SBOM and signed artifacts	0s
	25m 21s

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