mypy: Ignore Python 3.13 doctest issuse

src/doctest_docutils.py:558: error: Too many values to unpack (2 expected, 6 provided)  [misc]
src/doctest_docutils.py:572: error: Too many values to unpack (2 expected, 6 provided)  [misc]
src/doctest_docutils.py:574: error: Too many values to unpack (2 expected, 6 provided)  [misc]
src/pytest_doctest_docutils.py:269: error: Incompatible return value type (got "TestResults", expected "tuple[int, int]")  [return-value]

- python/typeshed#12625
- doctest.TestResults:
  - typeshed: https://github.com/python/typeshed/blob/089953e/stdlib/doctest.pyi#L47-L55
  - 3.12:
    - https://github.com/python/cpython/blob/3.12/Lib/doctest.py#L108
  - 3.13:
    - https://github.com/python/cpython/blob/3.13/Lib/doctest.py#L111

src/doctest_docutils.py

@@ -556,7 +556,7 @@ def _test() -> int:
         options |= doctest.FAIL_FAST
     for filename in testfiles:
         if filename.endswith((".rst", ".md")) or args.docutils:
-            failures, _ = testdocutils(
+            failures, _ = testdocutils(  # type: ignore
                 filename,
                 module_relative=False,
                 verbose=verbose,
@@ -570,9 +570,9 @@ def _test() -> int:
             sys.path.insert(0, dirname)
             m = __import__(filename[:-3])
             del sys.path[0]
-            failures, _ = doctest.testmod(m, verbose=verbose, optionflags=options)
+            failures, _ = doctest.testmod(m, verbose=verbose, optionflags=options)  # type:ignore
         else:
-            failures, _ = doctest.testfile(
+            failures, _ = doctest.testfile(  # type:ignore
                 filename,
                 module_relative=False,
                 verbose=verbose,

src/pytest_doctest_docutils.py

@@ -267,7 +267,7 @@ def summarize(  # type: ignore
         finally:
             sys.stdout = old_stdout
         out(string_io.getvalue())
-        return res
+        return res  # type:ignore
 
     def _DocTestRunner__patched_linecache_getlines(
         self,