fix: self not in function

Author: FlorentLvr

src/core/modules/common/integrations/LinkedInIntegration.py

@@ -254,7 +254,7 @@ def get_profile_posts(
 
         return df.reset_index(drop=True)
 
-    def get_organization_id(url: str) -> str:
+    def get_organization_id(self, url: str) -> str:
         """Extract organization ID from LinkedIn URL.
         
         Handles company, school and showcase pages.