Bump step-security/harden-runner from 2.15.0 to 2.15.1 #171

Job	Run time
ruby-versions / Generate Ruby versions	5s
build (2.7 / macos-latest)	41s
build (3.0 / macos-latest)	14s
build (2.7 / ubuntu-latest)	23s
build (3.2 / ubuntu-latest)	12s
build (4.0 / ubuntu-latest)	15s
build (3.1 / macos-latest)	12s
build (3.0 / ubuntu-latest)	11s
build (3.1 / ubuntu-latest)	11s
build (2.6 / ubuntu-latest)	26s
build (3.2 / macos-latest)	15s
build (2.6 / macos-latest)	34s
build (3.3 / ubuntu-latest)	11s
build (3.4 / ubuntu-latest)	12s
build (3.3 / macos-latest)	11s
build (3.4 / macos-latest)	12s
build (4.0 / macos-latest)	13s
build (head / macos-latest)	11s
build (head / ubuntu-latest)	12s
	5m 1s

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