bump to v2.18.0 (#2120) #4231

Job	Run time
danger	12s
lint (20.x, frontend)	46s
lint (20.x, api)	22s
lint (20.x, blockchain)	14s
lint (20.x, provisioning)	11s
audit (20.x, frontend)	32s
audit (20.x, api)	16s
audit (20.x, blockchain)	31s
audit (20.x, provisioning)	8s
audit (20.x, e2e-test)	19s
audit (20.x, excel-export-service)	11s
audit (20.x, email-notification-service)	14s
audit (20.x, storage-service)	17s
audit (20.x, logging-service)	21s
audit (20.x, frontend-collector)	7s
audit (20.x, migration)	12s
test (20.x, frontend)	57s
test (20.x, api)	37s
build (frontend)	2m 41s
build (api)	1m 44s
build (blockchain)	52s
build (provisioning)	43s
build (e2e-test)	1m 5s
build (excel-export-service)	1m 2s
build (email-notification-service)	54s
build (storage-service)	1m 43s
build (frontend-collector)	37s
build (migration)	47s
notification	7s
	18m 42s

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