test

Bump step-security/harden-runner from 2.14.2 to 2.15.0 #310

Job	Run time
ruby-versions / Generate Ruby versions	5s
build (2.6 / ubuntu-latest)	28s
build (2.6 / windows-latest)	1m 45s
build (3.0 / macos-latest)	17s
build (2.7 / ubuntu-latest)	28s
build (3.0 / ubuntu-latest)	14s
build (2.7 / macos-latest)	31s
build (2.7 / windows-latest)	2m 7s
build (2.6 / macos-latest)	36s
build (3.1 / ubuntu-latest)	15s
build (3.0 / windows-latest)	1m 28s
build (head / macos-latest)	17s
build (3.4 / macos-latest)	16s
build (3.1 / macos-latest)	16s
build (3.2 / windows-latest)	1m 8s
build (3.3 / macos-latest)	14s
build (3.1 / windows-latest)	1m 7s
build (truffleruby-head / macos-latest)	31s
build (truffleruby / macos-latest)	28s
build (4.0 / windows-latest)	1m 7s
build (3.3 / ubuntu-latest)	16s
build (truffleruby / ubuntu-latest)	28s
build (3.2 / macos-latest)	13s
build (3.4 / windows-latest)	53s
build (4.0 / ubuntu-latest)	16s
build (3.2 / ubuntu-latest)	13s
build (head / windows-latest)	1m 0s
build (3.3 / windows-latest)	1m 39s
build (head / ubuntu-latest)	11s
build (truffleruby-head / ubuntu-latest)	37s
build (4.0 / macos-latest)	15s
build (3.4 / ubuntu-latest)	13s
	19m 52s

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