Link to endoflife.date/python in "Status of Python versions" (#1494)

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>

Author: warsaw

versions.rst

@@ -16,6 +16,8 @@ Python release cycle
 .. raw:: html
    :file: include/release-cycle.svg
 
+Another useful visualization is `endoflife.date/python <https://endoflife.date/python>`_.
+
 Supported versions
 ==================