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Bump version to 13.4.0-beta.2 #2066

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Run time

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Job	Run time
Build	54s
Test (2.3)	55s
Test (2.4)	58s
Test (2.5)	56s
Test (2.6)	51s
Test (2.7)	55s
Test (3.0)	50s
Test (3.1)	53s
Test (3.2)	55s
Test (3.3)	54s
Test (jruby-9.4.0.0)	1m 47s
Test (truffleruby-head)	2m 34s
Publish	0s
	13m 22s