CI: Disable benchmarking of some versions on Ruby #374

Job	Run time
ruby-versions / Generate Ruby versions	2s
ubuntu-latest 2.7	1m 1s
ubuntu-latest 3.0	32s
ubuntu-latest 3.1	35s
ubuntu-latest 3.2	33s
ubuntu-latest 3.3	34s
ubuntu-latest debug	48s
ubuntu-latest head	35s
macos-latest 2.7	54s
macos-latest 3.0	23s
macos-latest 3.1	45s
macos-latest 3.2	31s
macos-latest 3.3	24s
macos-latest debug	29s
macos-latest head	22s
macos-14 2.7	1m 0s
macos-14 3.0	24s
macos-14 3.1	28s
macos-14 3.2	23s
macos-14 3.3	23s
macos-14 debug	30s
macos-14 head	24s
windows-latest 2.7	4m 33s
windows-latest 3.3	3m 23s
windows-latest head	2m 45s
windows-latest mingw	2m 54s
windows-latest mswin	2m 4s
	27m 39s

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