Don't test for malloc_trim on Ruby >= 3.3 #284

Job	Run time
Determine necessary jobs	19s
Check whether workflow is up-to-date	2s
Install gem bundle	42s
Build Docker image [centos-8]	0s
Build Docker image [debian-10]	0s
Build Docker image [debian-11]	0s
Build Docker image [debian-12]	0s
Build Docker image [el-9]	0s
Build Docker image [ubuntu-20.04]	0s
Build Docker image [ubuntu-22.04]	0s
Download Ruby source [3.1.4]	9s
Build Docker image [utility]	0s
Download Ruby source [3.3.0]	13s
Download Ruby source [3.2.2]	14s
Download Ruby source [3.0.6]	14s
Download Rbenv source	21s
Build common DEB	31s
Build common RPM	24s
Check whether any version numbers need to be changed	13s
Build Rbenv DEB	32s
Build Rbenv RPM	28s
Finalize	1m 22s
	5m 44s

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