BUILD/MEDIUM: models: upgrade go-method-gen and commit changes #1234

Job	Run time
generate-specification	11s
generate-models	1m 24s
HAProxy check commit message	-1s
golangci-lint	0s
license-check	0s
Build	0s
lint-spec	0s
go mod tidy	0s
Test equal	-1s
e2e on HAProxy	-1s
Tests	-1s
	1m 31s

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