test

Bump the required BASERUBY version to 2.7 #1060

Job	Run time
test-memory (head)	29s
check-misc (head)	9s
steep-check (head)	29s
test-ruby (head, master)	4m 57s
test-ruby (3.0, master)	5m 23s
test-windows (head)	1m 53s
test-ruby (2.7, master)	3m 33s
ruby-versions / Generate Ruby versions	2s
test (2.5)	26s
test (2.6)	29s
test (2.7)	24s
test (3.0)	15s
test (3.1)	14s
test (3.2)	10s
test (3.3)	12s
test (head)	13s
	19m 18s

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