Bump steep gem version to 1.9.2 #1458

Job	Run time
steep-check (head)	30s
check-misc (head)	12s
test-memory (head)	38s
test-ruby (head, master)	6m 3s
test-windows (head)	1m 31s
test-ruby (3.0, master)	6m 16s
ruby-versions / Generate Ruby versions	3s
test-cpp (head, g++)	13s
test (2.5)	26s
test-cpp (head, clang++)	12s
test (2.6)	32s
test (2.7)	32s
test (3.0)	12s
test (3.1)	19s
test (3.2)	15s
test (3.3)	16s
test (head)	13s
	18m 23s

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