Update list of experimental classes #2817

Job	Run time
doc-lints	43s
godot-itest (macos)	1m 8s
license-guard	30s
godot-itest (windows)	2m 57s
clippy	1m 44s
run-examples	1m 19s
godot-itest (linux-full)	2m 46s
rustfmt	12s
godot-itest (linux-features-experimental)	2m 8s
unit-test	2m 44s
godot-itest (linux-4.1)	1m 12s
godot-itest (linux-4.2)	1m 30s
godot-itest (linux-memcheck)	2m 29s
ci-status	3s
	21m 25s

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