test

Update rbs gem version to 3.8.1 #571

Job	Run time
check-misc (head)	7s
test-memory (head)	48s
steep-check (head)	23s
test-ruby (head, master)	6m 14s
test-ruby (3.0, master)	6m 5s
test-windows (head)	2m 4s
ruby-versions / Generate Ruby versions	4s
test-cpp (head, g++)	19s
test (2.5)	32s
test-cpp (head, clang++)	21s
test (2.6)	27s
test-c (head, cc)	12s
test (2.7)	25s
test-c (head, gcc)	13s
test (3.0)	14s
test-c (head, clang)	18s
test (3.1)	16s
test (3.2)	16s
test (3.3)	15s
test (3.4)	19s
test (head)	17s
	20m 9s

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