Fix typo #580

Job	Run time
Test without C extension	3m 5s
Test isolated (2.3)	3m 44s
Tests: Ruby 2.3 - ubuntu	3m 18s
Test isolated (ruby)	3m 26s
Tests: Ruby 2.4 - ubuntu	3m 17s
Tests: Ruby 2.5 - ubuntu	3m 18s
Tests: Ruby 2.6 - ubuntu	3m 21s
Tests: Ruby 2.7 - ubuntu	3m 18s
Tests: Ruby 3.0 - ubuntu	3m 6s
Tests: Ruby 3.1 - ubuntu	3m 5s
Tests: Ruby 3.2 - ubuntu	3m 4s
Tests: Ruby 3.3 - ubuntu	3m 5s
Tests: Ruby 3.4 - ubuntu	3m 5s
Tests: Ruby jruby - ubuntu	5m 4s
Tests: Ruby truffleruby - ubuntu	4m 10s
Tests: Ruby ruby - windows	5m 47s
	57m 13s

Provide feedback