BUILD/MINOR: go.mod: update github.com/google/go-cmp v0.6.0 #424

Job	Run time
HAProxy check commit message	0s
generate-models	2m 16s
generate-specification	51s
go mod tidy	7s
lint-spec	8s
Build	44s
golangci-lint	1m 22s
Tests	59s
e2e on HAProxy (2.1)	37s
e2e on HAProxy (2.2)	32s
e2e on HAProxy (2.3)	38s
e2e on HAProxy (2.4)	35s
e2e on HAProxy (2.5)	35s
e2e on HAProxy (2.6)	35s
e2e on HAProxy (2.7)	38s
e2e on HAProxy (2.8)	36s
	11m 13s

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