gh-132604: Track deprecation related to runtime-checkable protocols (3.20) (GH-154790)

* Track deprecation related to runtime-checkable protocols until 3.20

* Add deprecation note to 3.15 what's new
(cherry picked from commit b4db948)

Co-authored-by: Bartosz Sławecki <bartosz@ilikepython.com>

Author: johnslavik

Doc/deprecations/pending-removal-in-3.20.rst

@@ -53,3 +53,12 @@ Pending removal in Python 3.20
 
   * Creating instances of abstract AST nodes (such as :class:`ast.AST`
     or :class:`!ast.expr`) is deprecated and will raise an error in Python 3.20.
+
+* :mod:`typing`:
+
+  * It is deprecated to call :func:`isinstance` and :func:`issubclass` checks on
+    protocol classes that were not explicitly decorated with :func:`!runtime_checkable`
+    but that inherit from a runtime-checkable protocol class.
+    This will raise a :exc:`TypeError` in Python 3.20.
+
+    (Contributed by Bartosz Sławecki in :gh:`132604`.)

Doc/whatsnew/3.15.rst

@@ -2301,6 +2301,13 @@ New deprecations
     :func:`issubclass`, but warnings were not previously emitted if it was
     merely imported or accessed from the :mod:`!typing` module.
 
+  * It is deprecated to call :func:`isinstance` and :func:`issubclass` checks on
+    protocol classes that were not explicitly decorated with :func:`!runtime_checkable`
+    but that inherit from a runtime-checkable protocol class.
+    This will raise a :exc:`TypeError` in Python 3.20.
+
+    (Contributed by Bartosz Sławecki in :gh:`132604`.)
+
 
 * :mod:`webbrowser`: