Bump step-security/harden-runner from 2.10.3 to 2.10.4 #162

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (2.6 / ubuntu-latest)	32s
build (2.6 / macos-latest)	42s
build (2.6 / windows-latest)	3m 52s
build (2.7 / ubuntu-latest)	32s
build (2.7 / macos-latest)	35s
build (2.7 / windows-latest)	4m 17s
build (3.0 / ubuntu-latest)	21s
build (3.0 / macos-latest)	18s
build (3.0 / windows-latest)	2m 4s
build (3.1 / ubuntu-latest)	19s
build (3.1 / macos-latest)	19s
build (3.1 / windows-latest)	1m 7s
build (3.2 / ubuntu-latest)	20s
build (3.2 / macos-latest)	20s
build (3.2 / windows-latest)	2m 22s
build (3.3 / ubuntu-latest)	18s
build (3.3 / macos-latest)	22s
build (3.3 / windows-latest)	3m 0s
build (3.4 / ubuntu-latest)	17s
build (3.4 / macos-latest)	19s
build (3.4 / windows-latest)	1m 32s
build (head / ubuntu-latest)	18s
build (head / macos-latest)	20s
build (head / windows-latest)	1m 13s
	25m 41s

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