Bump docker/metadata-action from 5.5.1 to 5.6.1 (#1313) #6004

Job	Run time
build-auto-instrumentation	1m 23s
kubernetes-test (v1.26.0, autosdk)	2m 36s
kubernetes-test (v1.26.0, nethttp)	2m 49s
kubernetes-test (v1.26.0, nethttp_custom)	3m 26s
kubernetes-test (v1.26.0, gin)	3m 22s
kubernetes-test (v1.26.0, databasesql)	3m 40s
kubernetes-test (v1.26.0, grpc)	3m 2s
kubernetes-test (v1.26.0, otelglobal)	2m 58s
kubernetes-test (v1.26.0, kafka-go)	2m 19s
	25m 35s

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