Fix ruby 3.4 compatibility #297

Job	Run time
test (2.7, ubuntu-latest)	2m 14s
test (2.7, windows-latest)	5m 16s
test (3.0, ubuntu-latest)	2m 38s
test (3.0, windows-latest)	3m 52s
test (3.1, ubuntu-latest)	1m 46s
test (3.1, windows-latest)	4m 5s
test (3.2, ubuntu-latest)	2m 10s
test (3.2, windows-latest)	3m 53s
test (3.3, ubuntu-latest)	1m 47s
test (3.3, windows-latest)	7m 6s
test (ruby-head, ubuntu-latest)	7s
test (ruby-head, windows-latest)	1m 53s
	36m 47s

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