fix: connaisseur/flask_application.py:96:4: C0103: Variable name "l" …

…does not conform to snake_case naming style (invalid-name)

connaisseur/flask_application.py

@@ -93,13 +93,13 @@ def mutate():
 
 
 def metrics_label(response, label):
-    l = response.get_json(silent=True)
-    if l:
+    json_response = response.get_json(silent=True)
+    if json_response:
         if label == "allowed":
-            return l["response"]["allowed"]
+            return json_response["response"]["allowed"]
         elif label == "status_code":
-            return l["response"]["status"]["code"]
-    return l
+            return json_response["response"]["status"]["code"]
+    return json_response
 
 
 # health probe