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Bump version to 13.2.0-beta.2 #1937

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Run time

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Job	Run time
Build	36s
Test (2.3)	53s
Test (2.4)	52s
Test (2.5)	54s
Test (2.6)	51s
Test (2.7)	1m 1s
Test (3.0)	46s
Test (3.1)	53s
Test (3.2)	52s
Test (3.3)	47s
Test (jruby-9.4.0.0)	1m 41s
Test (truffleruby-head)	2m 13s
Publish	0s
	12m 19s