CI/CD

Add iCalendar export support #5605

Job	Run time
Run pre-commit	27s
CodeQL	1m 35s
Test Python 3.9 on macos-latest	51s
Test Python 3.10 on macos-latest	49s
Test Python 3.11 on macos-latest	36s
Test Python 3.12 on macos-latest	53s
Test Python 3.13 on macos-latest	35s
Test Python 3.9 on ubuntu-latest	53s
Test Python 3.10 on ubuntu-latest	49s
Test Python 3.11 on ubuntu-latest	48s
Test Python 3.12 on ubuntu-latest	1m 8s
Test Python 3.13 on ubuntu-latest	53s
Test Python 3.9 on windows-latest	1m 41s
Test Python 3.10 on windows-latest	1m 59s
Test Python 3.11 on windows-latest	1m 56s
Test Python 3.12 on windows-latest	2m 6s
Test Python 3.13 on windows-latest	1m 43s
Test docs build	31s
Build distribution	21s
Test build on macos-latest	32s
Test build on ubuntu-latest	40s
Test build on windows-latest	2m 14s
Publish generated artifacts	0s
Create SHA1 checksums and Sigstore signatures	0s
Update GitHub release with SBOM and signed artifacts	0s
	24m 0s

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