Add bun support #83

Job	Run time
test (ubuntu-latest, 2.7)	39s
test (ubuntu-latest, 3.0)	24s
test (ubuntu-latest, 3.1)	30s
test (ubuntu-latest, head)	1m 14s
test (ubuntu-latest, jruby)	1m 7s
test (ubuntu-latest, jruby-head)	1m 12s
test (ubuntu-latest, truffleruby)	2m 16s
test (ubuntu-latest, truffleruby-head)	1m 47s
test (macos-latest, 2.7)	1m 37s
test (macos-latest, 3.0)	34s
test (macos-latest, 3.1)	1m 10s
test (macos-latest, head)	3m 11s
test (macos-latest, jruby)	2m 25s
test (macos-latest, jruby-head)	2m 37s
test (macos-latest, truffleruby)	9m 41s
test (macos-latest, truffleruby-head)	3m 20s
	33m 44s

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