BUILD/MINOR: go.mod: update golang.org/x packages #388

Job	Run time
HAProxy check commit message	0s
generate-models	1m 51s
generate-specification	1m 20s
Build	42s
golangci-lint	2m 7s
lint-spec	9s
go mod tidy	1m 3s
Tests	44s
e2e on HAProxy (2.1)	1m 24s
e2e on HAProxy (2.2)	1m 0s
e2e on HAProxy (2.3)	1m 17s
e2e on HAProxy (2.4)	1m 11s
e2e on HAProxy (2.5)	1m 19s
e2e on HAProxy (2.6)	1m 16s
e2e on HAProxy (2.7)	1m 3s
e2e on HAProxy (2.8)	1m 4s
	17m 30s

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