Continuous integration

Upgrade to v4 of `upload-artifact` GitHub action #1075

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Run time

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Job	Run time
Upload event file	3s
JDK 11 on macos-latest	1m 31s
JDK 11 on macos-14	1m 28s
JDK 11 on ubuntu-latest	1m 18s
JDK 11 on windows-latest	2m 59s
JDK 17 on ubuntu-latest	1m 6s
JDK 21 on ubuntu-latest	1m 11s
Publish snapshot	1s
Generate latest docs	1s
	9m 38s