Remove --experimental-versions (and related flags) as it is now GA #5558

Job	Run time
Checks	0s
Add PR to project	3s
Checks	4m 7s
Tests (macos-13, ./fixtures/*)	2m 0s
Tests (macos-13, ./packages/*)	4m 39s
Tests (ubuntu-latest, ./fixtures/*)	53s
Tests (ubuntu-latest, ./packages/*)	2m 40s
Tests (windows-latest, ./fixtures/*)	1m 33s
Tests (ubuntu-latest, ./tools)	1m 19s
Tests (windows-latest, ./packages/*)	4m 43s
	21m 57s

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