BUILD/MINOR: go.mod: update golang.org/x packages #686

Job	Run time
generate-specification	42s
HAProxy check commit message	0s
generate-models	1m 10s
go mod tidy	8s
Build	20s
lint-spec	9s
golangci-lint	3m 23s
Tests	32s
e2e on HAProxy (2.1)	43s
e2e on HAProxy (2.2)	44s
e2e on HAProxy (2.3)	41s
e2e on HAProxy (2.4)	41s
e2e on HAProxy (2.5)	41s
e2e on HAProxy (2.6)	42s
e2e on HAProxy (2.7)	41s
e2e on HAProxy (2.8)	40s
	11m 57s

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