Move truffleruby{,+graalvm}-head to ubuntu-22.04 #67

Job	Run time
test (macos-latest, 2.6)	2m 55s
test (macos-latest, 2.7)	2m 22s
test (macos-latest, 3.0)	1m 11s
test (macos-latest, 3.1)	2m 31s
test (macos-latest, 3.2)	58s
test (macos-latest, head)	49s
test (macos-latest, jruby)	2m 5s
test (macos-latest, jruby-head)	2m 4s
test (macos-latest, truffleruby)	2m 51s
test (macos-latest, truffleruby+graalvm)	4m 38s
test (ubuntu-20.04, 2.6)	52s
test (ubuntu-20.04, 2.7)	46s
test (ubuntu-20.04, 3.0)	25s
test (ubuntu-20.04, 3.1)	36s
test (ubuntu-20.04, 3.2)	30s
test (ubuntu-20.04, head)	21s
test (ubuntu-20.04, jruby)	1m 46s
test (ubuntu-20.04, jruby-head)	1m 32s
test (ubuntu-20.04, truffleruby)	1m 54s
test (ubuntu-20.04, truffleruby+graalvm)	2m 57s
test (windows-latest, mingw)	1m 36s
test (windows-latest, mswin)	2m 23s
test (windows-latest, jruby, true)	3m 24s
test (ubuntu-22.04, head)	29s
test (ubuntu-22.04, 3.1)	37s
test (ubuntu-22.04, 3.2)	27s
test (ubuntu-22.04, truffleruby+graalvm-head, true)	3s
test (ubuntu-22.04, truffleruby-head, true)	1m 46s
	44m 48s

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