DOC: Start v1.4.3 release notes (pandas-dev#46609)

Author: simonjayhawkins

doc/source/whatsnew/index.rst

@@ -24,6 +24,7 @@ Version 1.4
 .. toctree::
    :maxdepth: 2
 
+   v1.4.3
    v1.4.2
    v1.4.1
    v1.4.0

doc/source/whatsnew/v1.4.2.rst

@@ -42,4 +42,4 @@ Bug fixes
 Contributors
 ~~~~~~~~~~~~
 
-.. contributors:: v1.4.1..v1.4.2|HEAD
+.. contributors:: v1.4.1..v1.4.2

doc/source/whatsnew/v1.4.3.rst

@@ -0,0 +1,45 @@
+.. _whatsnew_143:
+
+What's new in 1.4.3 (April ??, 2022)
+------------------------------------
+
+These are the changes in pandas 1.4.3. See :ref:`release` for a full changelog
+including other versions of pandas.
+
+{{ header }}
+
+.. ---------------------------------------------------------------------------
+
+.. _whatsnew_143.regressions:
+
+Fixed regressions
+~~~~~~~~~~~~~~~~~
+-
+-
+
+.. ---------------------------------------------------------------------------
+
+.. _whatsnew_143.bug_fixes:
+
+Bug fixes
+~~~~~~~~~
+-
+-
+
+.. ---------------------------------------------------------------------------
+
+.. _whatsnew_143.other:
+
+Other
+~~~~~
+-
+-
+
+.. ---------------------------------------------------------------------------
+
+.. _whatsnew_143.contributors:
+
+Contributors
+~~~~~~~~~~~~
+
+.. contributors:: v1.4.2..v1.4.3|HEAD