test

Move private constants under `Dir::Tmpname` module #108

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (2.7 / ubuntu-latest)	19s
build (2.7 / macos-latest)	23s
build (2.7 / windows-latest)	1m 42s
build (3.0 / ubuntu-latest)	8s
build (3.0 / macos-latest)	6s
build (3.0 / windows-latest)	29s
build (3.1 / ubuntu-latest)	7s
build (3.1 / macos-latest)	9s
build (3.1 / windows-latest)	19s
build (3.2 / ubuntu-latest)	7s
build (3.2 / macos-latest)	7s
build (3.2 / windows-latest)	30s
build (3.3 / ubuntu-latest)	7s
build (3.3 / macos-latest)	8s
build (3.3 / windows-latest)	54s
build (head / ubuntu-latest)	5s
build (head / macos-latest)	9s
build (mingw / windows-latest)	16s
build (mswin / windows-latest)	19s
	6m 26s

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