Test

Improve how gemspec's files are defined #1065

Job	Run time
lint	22s
ruby-versions / Generate Ruby versions	2s
test (3.0, ubuntu-latest)	33s
test (3.0, macos-latest)	32s
test (3.0, windows-latest)	2m 5s
test (3.1, ubuntu-latest)	29s
test (3.1, macos-latest)	32s
test (3.1, windows-latest)	2m 9s
test (3.2, ubuntu-latest)	33s
test (3.2, macos-latest)	24s
test (3.2, windows-latest)	1m 56s
test (3.3, ubuntu-latest)	23s
test (3.3, macos-latest)	27s
test (3.3, windows-latest)	3m 26s
test (head, ubuntu-latest)	35s
test (head, macos-latest)	25s
test (head, windows-latest)	2m 8s
test (jruby, ubuntu-latest)	2m 10s
test (jruby, macos-latest)	1m 19s
test (jruby-head, ubuntu-latest)	2m 17s
test (jruby-head, macos-latest)	1m 57s
test (truffleruby, ubuntu-latest)	2m 25s
test (truffleruby, macos-latest)	2m 10s
test (truffleruby-head, ubuntu-latest)	3m 28s
test (truffleruby-head, macos-latest)	3m 2s
	35m 49s

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