BUILD/MINOR: go.mod: update github.com/google/go-cmp v0.6.0 #423

Job	Run time
HAProxy check commit message	0s
generate-models	1m 48s
generate-specification	43s
golangci-lint	3m 19s
go mod tidy	6s
lint-spec	11s
Build	31s
Tests	46s
e2e on HAProxy (2.1)	1m 8s
e2e on HAProxy (2.2)	1m 7s
e2e on HAProxy (2.3)	1m 3s
e2e on HAProxy (2.4)	1m 12s
e2e on HAProxy (2.5)	1m 15s
e2e on HAProxy (2.6)	1m 6s
e2e on HAProxy (2.7)	1m 8s
e2e on HAProxy (2.8)	1m 0s
	16m 23s

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