Bump step-security/harden-runner from 2.10.2 to 2.10.3 #255

Job	Run time
ruby-versions / Generate Ruby versions	3s
build (2.5 / ubuntu-latest)	25s
build (2.5 / windows-latest)	1m 58s
build (2.6 / ubuntu-latest)	29s
build (2.6 / macos-latest)	29s
build (2.6 / windows-latest)	3m 2s
build (2.7 / ubuntu-latest)	25s
build (2.7 / macos-latest)	33s
build (2.7 / windows-latest)	3m 29s
build (3.0 / ubuntu-latest)	11s
build (3.0 / macos-latest)	15s
build (3.0 / windows-latest)	2m 8s
build (3.1 / ubuntu-latest)	12s
build (3.1 / macos-latest)	15s
build (3.1 / windows-latest)	1m 54s
build (3.2 / ubuntu-latest)	12s
build (3.2 / macos-latest)	15s
build (3.2 / windows-latest)	1m 45s
build (3.3 / ubuntu-latest)	13s
build (3.3 / macos-latest)	11s
build (3.3 / windows-latest)	1m 38s
build (3.4 / ubuntu-latest)	10s
build (3.4 / macos-latest)	28s
build (3.4 / windows-latest)	1m 31s
build (head / ubuntu-latest)	14s
build (head / macos-latest)	15s
build (truffleruby-head / ubuntu-latest)	32s
build (truffleruby-head / macos-latest)	32s
build (mswin / windows-latest)	1m 39s
build (mingw / windows-latest)	1m 34s
	26m 57s

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