chore: drop unused utility method

erpnext/accounts/report/accounts_receivable/accounts_receivable.py

@@ -1445,17 +1445,8 @@ class InitSQLProceduresForAR:
 	end;
 	"""
 
-	def get_existing_procedures(self):
-		procedures = frappe.db.sql(
-			f"select routine_name from information_schema.routines where routine_type in ('FUNCTION','PROCEDURE') and routine_schema='{frappe.conf.db_name}';"
-		)
-		if procedures:
-			# normalize
-			procedures = [x[0] for x in procedures]
-		return procedures
-
 	def __init__(self):
-		existing_procedures = self.get_existing_procedures()
+		existing_procedures = frappe.db.get_routines()
 
 		if self.genkey_function_name not in existing_procedures:
 			frappe.db.sql(self.genkey_function_sql)