Remove deprecated node_classes, scoped_nodes, and mixins modules (#2300)

* Remove deprecated `node_classes` and `scoped_nodes` modules

* Remove export of import_module

Unused since f96e18b.

* Remove `astroid.mixins`

Author: jacobtylerwalls

ChangeLog

@@ -6,11 +6,6 @@ What's New in astroid 3.0.0?
 =============================
 Release date: TBA
 
-* Return all existing arguments when calling ``Arguments.arguments()``. This also means ``find_argname`` will now
-  use the whole list of arguments for its search.
-
-  Closes #2213
-
 * Add support for Python 3.12, including PEP 695 type parameter syntax.
 
   Closes #2201
@@ -19,6 +14,22 @@ Release date: TBA
 
   Refs #2137
 
+* Following a deprecation period starting in astroid 2.7.0, the ``astroid.node_classes``
+  and ``astroid.scoped_nodes`` modules have been removed in favor of ``astroid.nodes.node_classes``
+  and ``astroid.nodes.scoped_nodes``.
+
+  Closes #1072
+
+* Following a deprecation period starting in astroid 2.12.0, the ``astroid.mixins`` module
+  has been removed in favor of ``astroid.nodes._base_nodes`` (private).
+
+  Refs #1633
+
+* Return all existing arguments when calling ``Arguments.arguments()``. This also means ``find_argname`` will now
+  use the whole list of arguments for its search.
+
+  Closes #2213
+
 * Exclude class attributes from the ``__members__`` container of an ``Enum`` class when they are
   ``nodes.AnnAssign`` nodes with no assigned value.
 

astroid/__init__.py

@@ -32,10 +32,9 @@
 
 import functools
 import tokenize
-from importlib import import_module
 
 # isort: off
-# We have an isort: off on '__version__' because of a circular import in nodes.
+# We have an isort: off on 'astroid.nodes' because of a circular import.
 from astroid.nodes import node_classes, scoped_nodes
 
 # isort: on