Merge pull request #15237 from github/cklin-patch-1

Python: Fix typo in upgrade script

Author: cklin

python/downgrades/503c0516fba2e5da9570f00eb34ef43025ecb8fb/upgrade.properties

@@ -3,4 +3,4 @@ compatibility: backwards
 py_exprs.rel: run py_exprs.qlo
 py_stmts.rel: run py_stmts.qlo
 py_patterns.rel: delete
-py_patterns_lists.rel: delete
+py_pattern_lists.rel: delete