DOC: mention issue 263 in changelog

Author: gdementen

doc/source/changes/version_0_34_2.rst.inc

@@ -4,3 +4,5 @@ Fixes
 ^^^^^
 
 * fixed the viewer being unusable after showing a matplotlib plot (closes :editor_issue:`261`).
+
+* silence spurious debugger warning on Python 3.11 (closes :editor_issue:`263`).