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

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Author: pre-commit-ci[bot]

docs/source/common_issues.rst

@@ -233,7 +233,7 @@ Without the annotation mypy can't always figure out the
 precise type of ``a``.
 
 .. code-block:: python
-    
+
    a = []  # error: Need type annotation for "a" (hint: "a: list[<type>] = ...")
 
 You often need to specify the type when you assign an empty list or