Exploring: Python Extension Patterns v0.2.1 now supports Python 3.9 t…

…o Python 3.13. (#1367)

internals/exploring.rst

@@ -60,7 +60,7 @@ building your understanding of CPython internals and its evolution:
     "`Green Tree Snakes`_", "The missing Python AST docs", Thomas Kluyver, 3.6
     "`Yet another guided tour of CPython`_", "A guide for how CPython REPL works", Guido van Rossum, 3.5
     "`Python Asynchronous I/O Walkthrough`_", "How CPython async I/O, generator and coroutine works", Philip Guo, 3.5
-    "`Coding Patterns for Python Extensions`_", "Reliable patterns of coding Python Extensions in C", Paul Ross, 3.4
+    "`Coding Patterns for Python Extensions`_", "Reliable patterns of coding Python Extensions in C", Paul Ross, 3.9+
     "`Your Guide to the CPython Source Code`_", "Your Guide to the CPython Source Code", Anthony Shaw, 3.8
 
 .. csv-table:: **Historical references**