style: fix ruff-format blank line in dipclust.py

Author: adilraza99

malariagen_data/anoph/dipclust.py

@@ -504,7 +504,6 @@ def _dipclust_snp_trace(
 
         return snp_trace, n_snps
 
-
     def _insert_dipclust_snp_trace(
         self,
         *,