test

Use `#term_transitions` instead of `#shifts` #1666

Job	Run time
test-memory (head)	28s
test-windows (head)	2m 8s
check-misc (head)	8s
steep-check (head)	18s
test-ruby (head, master)	5m 31s
test-ruby (3.0, master)	5m 37s
ruby-versions / Generate Ruby versions	3s
test-c (head, cc)	11s
test-cpp (head, g++)	14s
test-c (head, gcc)	18s
test (2.5)	38s
test-cpp (head, clang++)	18s
test-c (head, clang)	17s
test (2.6)	41s
test (2.7)	35s
test (3.0)	22s
test (3.1)	22s
test (3.2)	23s
test (3.3)	30s
test (3.4)	19s
test (head)	12s
	19m 33s

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