fix: break long line in diagram.py to pass lint

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: dimitri-yatsenko

src/datajoint/diagram.py

@@ -747,7 +747,10 @@ def make_dot(self):
                     if cls is not None:
                         description = cls().describe(context=self.context).split("\n")
                         description = (
-                            ("-" * 30 if q.startswith("---") else (q.replace("->", "→") if "->" in q else q.split(":")[0]))
+                            (
+                                "-" * 30 if q.startswith("---")
+                                else (q.replace("->", "→") if "->" in q else q.split(":")[0])
+                            )
                             for q in description
                             if not q.startswith("#")
                         )