CLEANUP/MINOR: ci: remove deprecated gitlab token usage #490

Job	Run time
HAProxy check commit message	0s
generate-models	1m 15s
generate-specification	43s
golangci-lint	53s
Build	19s
lint-spec	7s
go mod tidy	7s
Tests	22s
e2e on HAProxy (2.1)	37s
e2e on HAProxy (2.2)	47s
e2e on HAProxy (2.3)	42s
e2e on HAProxy (2.4)	47s
e2e on HAProxy (2.5)	45s
e2e on HAProxy (2.6)	49s
e2e on HAProxy (2.7)	46s
	8m 59s

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