BUG/MINOR: ci: removing deprecated make target #506

Job	Run time
HAProxy check commit message	2s
generate-specification	44s
generate-models	1m 31s
license-check	50s
lint-spec	6s
golangci-lint	1m 1s
Build	23s
go mod tidy	7s
Tests	2m 55s
e2e on HAProxy (2.1)	40s
e2e on HAProxy (2.2)	42s
e2e on HAProxy (2.3)	44s
e2e on HAProxy (2.4)	41s
e2e on HAProxy (2.5)	41s
e2e on HAProxy (2.6)	40s
e2e on HAProxy (2.7)	43s
e2e on HAProxy (2.8)	40s
	13m 10s

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