BUILD/MINOR: go.mod: update golang.org/x packages #598

Job	Run time
generate-specification	48s
generate-models	1m 19s
HAProxy check commit message	0s
Build	27s
lint-spec	9s
golangci-lint	1m 4s
go mod tidy	11s
Tests	32s
e2e on HAProxy (2.1)	40s
e2e on HAProxy (2.2)	36s
e2e on HAProxy (2.3)	37s
e2e on HAProxy (2.4)	41s
e2e on HAProxy (2.5)	38s
e2e on HAProxy (2.6)	36s
e2e on HAProxy (2.7)	42s
e2e on HAProxy (2.8)	38s
	9m 38s

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