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Bump version to 13.5.0-beta.1 #2171

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Run time

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Job	Run time
Build	57s
Test (2.3)	56s
Test (2.4)	55s
Test (2.5)	1m 4s
Test (2.6)	52s
Test (2.7)	57s
Test (3.0)	52s
Test (3.1)	52s
Test (3.2)	53s
Test (3.3)	56s
Test (jruby-9.4.0.0)	1m 52s
Test (truffleruby-head)	2m 31s
Publish	5s
	13m 42s