[pre-commit.ci] auto fixes from pre-commit.com hooks

Author: pre-commit-ci[bot]

stdlib/@tests/stubtest_allowlists/common.txt

@@ -550,4 +550,3 @@ xml.etree.cElementTree.XMLParser.__init__  # Defined in C so has general signatu
 # These would ideally be special-cased by type checkers; see https://github.com/python/mypy/issues/2220
 xml.etree.ElementTree.Element.__iter__
 xml.etree.cElementTree.Element.__iter__
-