Try excluding jruby for now #87

Job	Run time
ruby-versions / Generate Ruby versions	3s
Test (2.7 / ubuntu-latest)	39s
Test (2.7 / macos-latest)	35s
Test (2.7 / windows-latest)	36s
Test (3.0 / ubuntu-latest)	21s
Test (3.0 / macos-latest)	41s
Test (3.0 / windows-latest)	35s
Test (3.1 / ubuntu-latest)	22s
Test (3.1 / macos-latest)	45s
Test (3.1 / windows-latest)	36s
Test (3.2 / ubuntu-latest)	20s
Test (3.2 / macos-latest)	44s
Test (3.2 / windows-latest)	36s
Test (head / ubuntu-latest)	23s
Test (head / macos-latest)	39s
Test (head / windows-latest)	33s
Test (truffleruby / ubuntu-latest)	32s
Test (truffleruby / macos-latest)	1s
Test (truffleruby-head / ubuntu-latest)	33s
Test (truffleruby-head / macos-latest)	1s
	9m 35s

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