test

Bump step-security/harden-runner from 2.14.1 to 2.15.0 #312

Job	Run time
ruby-versions / Generate Ruby versions	3s
build (2.6 / windows-latest)	1m 38s
build (2.7 / ubuntu-latest)	25s
build (2.6 / macos-latest)	33s
build (2.5 / ubuntu-latest)	22s
build (3.2 / macos-latest)	13s
build (3.1 / ubuntu-latest)	11s
build (3.0 / windows-latest)	58s
build (2.7 / macos-latest)	39s
build (3.3 / ubuntu-latest)	16s
build (3.2 / windows-latest)	54s
build (2.5 / windows-latest)	1m 31s
build (2.6 / ubuntu-latest)	22s
build (2.7 / windows-latest)	1m 40s
build (3.1 / macos-latest)	18s
build (truffleruby-head / macos-latest)	43s
build (3.0 / macos-latest)	13s
build (3.2 / ubuntu-latest)	12s
build (3.0 / ubuntu-latest)	11s
build (mswin / windows-latest)	1m 11s
build (3.1 / windows-latest)	1m 0s
build (3.3 / macos-latest)	11s
build (truffleruby / macos-latest)	22s
build (4.0 / ubuntu-latest)	12s
build (3.4 / windows-latest)	1m 5s
build (4.0 / windows-latest)	1m 23s
build (3.4 / macos-latest)	13s
build (head / ubuntu-latest)	10s
build (3.4 / ubuntu-latest)	19s
build (3.3 / windows-latest)	59s
build (head / macos-latest)	21s
build (jruby / ubuntu-latest)	50s
build (4.0 / macos-latest)	13s
build (jruby-head / ubuntu-latest)	47s
build (truffleruby-head / ubuntu-latest)	31s
build (truffleruby / ubuntu-latest)	28s
build (mingw / windows-latest)	51s
	22m 28s

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