bpo-39019: Implement missing __class_getitem__ for SpooledTemporaryFile

divide test call to 2 lines for PEP8
reference with :class:
python · ilevkivskyi · Dec 30, 2019 · ilevkivskyi · Dec 30, 2019 · isidentical
diff --git a/Lib/test/test_tempfile.py b/Lib/test/test_tempfile.py
diff --git a/Misc/NEWS.d/next/Library/2019-12-10-21-11-05.bpo-39019.YIlgZ7.rst b/Misc/NEWS.d/next/Library/2019-12-10-21-11-05.bpo-39019.YIlgZ7.rst
diff --git a/Lib/tempfile.py b/Lib/tempfile.py
diff --git a/Misc/NEWS.d/next/Library/2019-12-10-21-11-05.bpo-39019.YIlgZ7.rst b/Misc/NEWS.d/next/Library/2019-12-10-21-11-05.bpo-39019.YIlgZ7.rst
diff --git a/Lib/tempfile.py b/Lib/tempfile.py