Merge branch 'mk-fix-api-geo-spec' into 'master'

Fix api Geo spec

See merge request gitlab-org/gitlab-ee!4035

spec/fixtures/api/schemas/geo_node_status.json

@@ -50,8 +50,8 @@
     "lfs_objects_synced_count": { "type": ["integer", "null"] },
     "lfs_objects_synced_in_percentage": { "type": "string" },
     "job_artifacts_count": { "type": "integer" },
-    "job_artifacts_failed_count": { "type": "integer" },
-    "job_artifacts_synced_count": { "type": "integer" },
+    "job_artifacts_failed_count": { "type": ["integer", "null"] },
+    "job_artifacts_synced_count": { "type": ["integer", "null"] },
     "job_artifacts_synced_in_percentage": { "type": "string" },
     "repositories_count": { "type": "integer" },
     "repositories_failed_count": { "type": ["integer", "null"] },