Bump step-security/harden-runner from 2.8.1 to 2.9.0 (#239) #519

Job	Run time
Build (ubuntu, x64, openssl, static)	1m 41s
Build (ubuntu, x64, openssl, shared)	1m 41s
Build (windows, x86, schannel, static)	3m 40s
Build (windows, x86, schannel, shared)	3m 40s
Build (windows, x86, openssl, static)	4m 36s
Build (windows, x86, openssl, shared)	4m 37s
Build (windows, x64, schannel, static)	3m 18s
Build (windows, x64, schannel, shared)	4m 17s
Build (windows, x64, openssl, static)	5m 13s
Build (windows, x64, openssl, shared)	5m 38s
	38m 21s

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