Fix GitLab merge request state enum

Author: kempniu

danger_python/models.py

@@ -1466,7 +1466,7 @@ class GitLabMRState(Enum):
     CLOSED = "closed"
     LOCKED = "locked"
     MERGED = "merged"
-    OPEN = "open"
+    OPEN = "opened"
 
 
 class GitLabMRTimeStats(BaseModel):

scripts/input_schema.json

@@ -1842,7 +1842,7 @@
                         "closed",
                         "locked",
                         "merged",
-                        "open"
+                        "opened"
                     ],
                     "type": "string"
                 },