fix: change colour-ramp #579

Job	Run time
test	2m 18s
prepare_matrix	5s
test_build (download-file)	22s
test_build (gunzip-file)	28s
test_build (geoserver-publish-sld)	12s
test_build (geoserver-create-and-apply-sld)	22s
test_build (geoserver-publish-layer-from-db)	25s
test_build (geonetwork-publish-metadata)	19s
test_build (send-email)	13s
test_build (dispatcher)	15s
test_build (zip-handler)	1m 1s
test_build (upload-file)	12s
test_build (geoserver-publish-geotiff)	12s
test_build (geotiff-validator)	2m 24s
test_build (send-mattermost-message)	15s
test_build (geoserver-publish-imagemosaic)	24s
test_build (geoserver-create-imagemosaic-datastore)	29s
test_build (create-file)	15s
test_build (geotiff-optimizer)	13s
test_build (dataset-rotation)	46s
test_build (dataset-archive)	31s
test_build (create-contour)	33s
test_build (reclassify-geotiff)	22s
	12m 36s

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