Add DYNAMIC event type to GHEvent enum #4734

Job	Run time
site (Java 17)	5m 21s
build-only (Java 17)	48s
test Java 11 (no-build)	1m 6s
build-and-test Bridged (Java 17)	12m 33s
test (windows, Java 17)	11m 22s
test (windows, Java 21)	11m 3s
test (ubuntu, Java 21)	12m 36s
test (ubuntu, Java 17)	12m 34s
codecov-upload (Upload to codecov.io)	9s
	1h 7m 32s

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