CLEANUP/MINOR: ci: remove deprecated gitlab token usage #486

Job	Run time
HAProxy check commit message	0s
generate-models	1m 21s
generate-specification	43s
go mod tidy	9s
lint-spec	9s
Build	21s
golangci-lint	50s
Tests	30s
e2e on HAProxy (2.1)	53s
e2e on HAProxy (2.2)	53s
e2e on HAProxy (2.3)	52s
e2e on HAProxy (2.4)	47s
e2e on HAProxy (2.5)	50s
e2e on HAProxy (2.6)	46s
e2e on HAProxy (2.7)	46s
e2e on HAProxy (2.8)	57s
	10m 47s

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