ci: Ignore mypy error for unparse import

Author: pawamoy

src/pytkdocs/parsers/attributes.py

@@ -9,7 +9,7 @@
 try:
     from ast import unparse  # type: ignore
 except ImportError:
-    from astunparse import unparse
+    from astunparse import unparse  # type: ignore
 
 RECURSIVE_NODES = (ast.If, ast.IfExp, ast.Try, ast.With)