CI: fix job and artifact dependency after build optimization

The oniro toolchain is now in the toolchain job and now
longer part of the build job artifacts. Update dependencies
acordingly to let CI pass.

Signed-off-by: Stefan Schmidt <stefan.schmidt@huawei.com>

.gitlab-ci.yml

@@ -535,7 +535,7 @@ ohos:
       optional: true
     - job: ohos_fetch
       artifacts: true
-    - job: build
+    - job: toolchain
       artifacts: true
   parallel:
     matrix: