test

Remove bundler-cache option from GitHub Actions workflow #595

Job	Run time
test-memory (head)	42s
steep-check (head)	17s
check-misc (head)	13s
test-ruby (head, master)	5m 34s
test-windows (head)	2m 6s
test-ruby (3.0, master)	6m 36s
ruby-versions / Generate Ruby versions	3s
test-c (head, cc)	18s
test-c (head, gcc)	17s
test-cpp (head, g++)	16s
test-c (head, clang)	14s
test-cpp (head, clang++)	12s
test (2.5)	34s
test (2.6)	35s
test (2.7)	37s
test (3.0)	21s
test (3.1)	21s
test (3.2)	18s
test (3.3)	23s
test (3.4)	19s
test (head)	19s
	20m 35s

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