docs: Update mailing list information in devguide

Signed-off-by: Abhishek Kumar <[email protected]>

.github/CONTRIBUTING.md

@@ -32,9 +32,9 @@ our workflow that are not covered by a bot or status check are:
 Due to the fact that this project is entirely volunteer-run (i.e. no one is paid
 to work on Python full-time), we unfortunately can make no guarantees as to if
 or when a core developer will get around to reviewing your pull request.
-If no core developer has done a review or responded to changes made because of a
-"changes requested" review, please feel free to email [python-dev](https://mail.python.org/mailman3/lists/python-dev.python.org/) to ask if
-someone could take a look at your pull request.
+If no core developer has done a review or responded to changes made because of a "changes requested" review, please consider seeking assistance through the [python-core-dev](https://discuss.python.org/c/core-dev/23).
+
+Please note that the traditional `python-dev` mailing list has been retired.
 
 
 ## Code of Conduct

developer-workflow/communication-channels.rst

@@ -45,7 +45,7 @@ Mailing lists
  should go to the python-list_ or python-help_ mailing lists, or the
  `Python Help`_ category on Discourse.
 
-Existing threads on the python-dev_, python-committers_, and python-ideas_ mailing lists
+Existing threads on the python-core-dev_, python-committers_, and python-ideas_ mailing lists
 can be accessed through the `online archive <web gateway_>`__.
 
 General Python questions should go to `python-list`_ or `tutor`_
@@ -64,7 +64,7 @@ ways, including via web browsers, NNTP newsreaders, and RSS feed readers.
 
 .. _issue tracker: https://github.com/python/cpython/issues
 .. _python-committers: https://mail.python.org/mailman3/lists/python-committers.python.org/
-.. _python-dev: https://mail.python.org/mailman3/lists/python-dev.python.org/
+.. _python-core-dev: https://discuss.python.org/c/core-dev/23
 .. _python-help: https://mail.python.org/mailman/listinfo/python-help
 .. _python-ideas: https://mail.python.org/mailman3/lists/python-ideas.python.org
 .. _python-list: https://mail.python.org/mailman/listinfo/python-list
@@ -80,7 +80,7 @@ Discourse (discuss.python.org web forum)
 ========================================
 
 We have our own `Discourse`_ forum for both developers and users. This forum
-complements the `python-dev`_, `python-ideas`_, `python-help`_, and
+complements the `python-core-dev`_, `python-ideas`_, `python-help`_, and
 `python-list`_ mailing lists.
 
 This forum has different categories and most core development discussions

getting-started/getting-help.rst

@@ -53,7 +53,7 @@ These mailing lists are for questions involving the
 development *of* Python, **not** for development *with* Python.
 
 .. _python-ideas: https://mail.python.org/mailman3/lists/python-ideas.python.org
-.. _python-dev: https://mail.python.org/mailman3/lists/python-dev.python.org/
+.. _python-dev: https://discuss.python.org/c/core-dev/23/
 
 
 Ask #python-dev