test

Bump version to 0.6.11 #537

Job	Run time
check-misc (head)	7s
test-windows (head)	1m 41s
steep-check (head)	16s
test-ruby (head, master)	6m 9s
test-memory (head)	31s
test-ruby (3.0, master)	6m 29s
ruby-versions / Generate Ruby versions	3s
test (2.5)	28s
test (2.6)	31s
test (2.7)	34s
test-cpp (head, g++)	16s
test (3.0)	14s
test (3.1)	13s
test-cpp (head, clang++)	17s
test (3.2)	11s
test (3.3)	12s
test (head)	12s
	18m 24s

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