test

Bump actions/checkout from 5 to 6 #2152

Job	Run time
test-windows (head)	2m 5s
check-misc (head)	17s
test-memory (head)	53s
test-ruby (3.1, master)	6m 18s
steep-check (3.4)	44s
test-ruby (head, master)	6m 31s
ruby-versions / Generate Ruby versions	4s
test-c (head, gcc)	26s
test-c (head, cc)	25s
test-c (head, clang)	27s
test-cpp (head, clang++)	24s
test (3.3)	22s
test (2.5)	51s
test (2.6)	36s
test (3.4)	29s
test (2.7)	41s
test (3.2)	25s
test (3.0)	25s
test-cpp (head, g++)	25s
test (head)	26s
test (3.1)	24s
	23m 38s

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