BUILD/MINOR: go.mod: update github.com/google/go-cmp v0.6.0 #419

Job	Run time
HAProxy check commit message	0s
generate-models	2m 7s
generate-specification	46s
golangci-lint	1m 58s
lint-spec	8s
go mod tidy	12s
Build	47s
Tests	1m 15s
e2e on HAProxy (2.1)	39s
e2e on HAProxy (2.2)	37s
e2e on HAProxy (2.3)	42s
e2e on HAProxy (2.4)	40s
e2e on HAProxy (2.5)	42s
e2e on HAProxy (2.6)	40s
e2e on HAProxy (2.7)	40s
e2e on HAProxy (2.8)	43s
	12m 36s

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