Update gitlab-ci.yml to install cargo vet

.gitlab-ci.yml

@@ -75,9 +75,10 @@ cargo:vet:
   script:
     - ./maint/rust-maint-common/via-cargo-install-in-ci cargo-vet
     # Entities that have audits to import
+    - cargo vet init
     - cargo vet import mozilla
     - cargo vet import isrg
     - cargo vet check
   cache:
     paths:
-      - cache
+      - cache