Bump step-security/harden-runner from 2.10.3 to 2.10.4 #117

Job	Run time
ruby-versions / Generate Ruby versions	2s
build (2.7 / ubuntu-latest)	23s
build (2.7 / macos-latest)	35s
build (2.7 / windows-latest)	1m 9s
build (3.0 / ubuntu-latest)	6s
build (3.0 / macos-latest)	9s
build (3.0 / windows-latest)	35s
build (3.1 / ubuntu-latest)	5s
build (3.1 / macos-latest)	6s
build (3.1 / windows-latest)	39s
build (3.2 / ubuntu-latest)	7s
build (3.2 / macos-latest)	8s
build (3.2 / windows-latest)	29s
build (3.3 / ubuntu-latest)	8s
build (3.3 / macos-latest)	15s
build (3.3 / windows-latest)	2m 5s
build (3.4 / ubuntu-latest)	6s
build (3.4 / macos-latest)	9s
build (3.4 / windows-latest)	1m 39s
build (head / ubuntu-latest)	5s
build (head / macos-latest)	12s
build (mingw / windows-latest)	19s
build (mswin / windows-latest)	17s
	9m 48s

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