Fixed version number of rubygems/release-gem #154

Job	Run time
ruby-versions / Generate Ruby versions	3s
build (2.6 / ubuntu-latest)	31s
build (2.6 / macos-latest)	46s
build (2.6 / windows-latest)	4m 45s
build (2.7 / ubuntu-latest)	34s
build (2.7 / macos-latest)	50s
build (2.7 / windows-latest)	3m 5s
build (3.0 / ubuntu-latest)	20s
build (3.0 / macos-latest)	21s
build (3.0 / windows-latest)	1m 14s
build (3.1 / ubuntu-latest)	23s
build (3.1 / macos-latest)	24s
build (3.1 / windows-latest)	2m 10s
build (3.2 / ubuntu-latest)	22s
build (3.2 / macos-latest)	24s
build (3.2 / windows-latest)	1m 12s
build (3.3 / ubuntu-latest)	18s
build (3.3 / macos-latest)	22s
build (3.3 / windows-latest)	1m 26s
build (head / ubuntu-latest)	19s
build (head / macos-latest)	23s
build (head / windows-latest)	1m 6s
	21m 18s

Provide feedback