test

Add `IO#ttyname` that returns the tty name or nil #1337

Job	Run time
ruby-versions / Generate Ruby versions	3s
test (2.6, ubuntu-latest)	28s
test (2.6, macos-latest)	42s
test (2.6, windows-latest)	2m 51s
test (2.7, ubuntu-latest)	30s
test (2.7, macos-latest)	38s
test (2.7, windows-latest)	2m 34s
test (3.0, ubuntu-latest)	15s
test (3.0, macos-latest)	18s
test (3.0, windows-latest)	1m 32s
test (3.1, ubuntu-latest)	25s
test (3.1, macos-latest)	25s
test (3.1, windows-latest)	1m 27s
test (3.2, ubuntu-latest)	21s
test (3.2, macos-latest)	21s
test (3.2, windows-latest)	1m 33s
test (3.3, ubuntu-latest)	28s
test (3.3, macos-latest)	30s
test (3.3, windows-latest)	2m 19s
test (head, ubuntu-latest)	16s
test (head, macos-latest)	19s
test (head, windows-latest)	1m 24s
test (jruby)	50s
test (jruby-head)	50s
test (truffleruby)	20s
test (truffleruby-head)	24s
	22m 3s

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