move to v1.3

Author: topper-123

doc/source/whatsnew/v1.2.1.rst

@@ -55,7 +55,6 @@ Other
 - Bumped minimum fastparquet version to 0.4.0 to avoid ``AttributeError`` from numba (:issue:`38344`)
 - Bumped minimum pymysql version to 0.8.1 to avoid test failures (:issue:`38344`)
 - Fixed build failure on MacOS 11 in Python 3.9.1 (:issue:`38766`)
-- ``inspect.getmembers(Series)`` no longer raises an ``AbstractMethodError`` (:issue:`38782`).
 - Added reference to backwards incompatible ``check_freq`` arg of :func:`testing.assert_frame_equal` and :func:`testing.assert_series_equal` in :ref:`pandas 1.1.0 whats new <whatsnew_110.api_breaking.testing.check_freq>` (:issue:`34050`)
 
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doc/source/whatsnew/v1.3.0.rst

@@ -174,7 +174,7 @@ See :ref:`install.dependencies` and :ref:`install.optional_dependencies` for mor
 Other API changes
 ^^^^^^^^^^^^^^^^^
 - Partially initialized :class:`CategoricalDtype` (i.e. those with ``categories=None`` objects will no longer compare as equal to fully initialized dtype objects.
--
+- Accessing ``_constructor_expanddim`` on a :class:`DataFrame` and ``_constructor_sliced`` on a :class:`Series` now raise an ``AttributeError``. Previously a ``NotImplementedError`` was raised (:issue:`38782`)
 -
 
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@@ -365,7 +365,7 @@ ExtensionArray
 Other
 ^^^^^
 - Bug in :class:`Index` constructor sometimes silently ignorning a specified ``dtype`` (:issue:`38879`)
--
+- ``inspect.getmembers(Series)`` no longer raises an ``AbstractMethodError`` (:issue:`38782`).
 -
 
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