Workaround: Fix test failures on Ubuntu jammy s390x. #108

Job	Run time
ruby-versions / Generate Ruby versions	5s
build (2.7 / ubuntu-latest)	33s
build (2.7 / macos-latest)	1m 19s
build (2.7 / windows-latest)	4m 28s
build (3.0 / ubuntu-latest)	13s
build (3.0 / macos-latest)	49s
build (3.0 / windows-latest)	3m 19s
build (3.1 / ubuntu-latest)	23s
build (3.1 / macos-latest)	33s
build (3.1 / windows-latest)	5m 51s
build (3.2 / ubuntu-latest)	16s
build (3.2 / macos-latest)	41s
build (3.2 / windows-latest)	4m 36s
build (head / ubuntu-latest)	17s
build (head / macos-latest)	31s
build (truffleruby-head / ubuntu-latest)	1m 8s
build (truffleruby-head / macos-latest)	1m 54s
build (mswin / windows-latest)	4m 56s
build (mingw / windows-latest)	2m 11s
	34m 3s

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