maint: fix method pluralization after ruby upgrade #145

Job	Run time
call-build-macos / build-macos	1m 35s
call-build-ubuntu / build-ubuntu	4m 15s
call-build-alpine / build-alpine	2m 4s
call-build-fedora / build-fedora	1m 50s
call-build-freebsd / build-freebsd	4m 7s
call-build-solaris / build-solaris	5m 55s
	19m 46s

Provide feedback