hgweb: drop references to deprecated cgitb cgitb is going away and gives warnings when importing, and that make tests fail: $TESTTMP/hgweb.cgi:5: DeprecationWarning: 'cgitb' is deprecated and slated for removal in Python 3.13 The lack of a "nice" high level error handler is not a huge problem, neither for users (where it is disabled anyway) or for tests (where we don't use a browser and the plain tracebacks often are more readable). It is inevitable that it is going away, and there is no obvious alternative. Remove it and move on.

--- a/hgweb.cgi	Tue Jun 27 12:09:17 2023 +0200
+++ b/hgweb.cgi	Mon Jun 26 18:00:28 2023 +0200
@@ -10,9 +10,6 @@
 # (consult "installed modules" path from 'hg debuginstall'):
 # import sys; sys.path.insert(0, "/path/to/python/lib")
 
-# Uncomment to send python tracebacks to the browser if an error occurs:
-# import cgitb; cgitb.enable()
-
 from mercurial import demandimport
 
 demandimport.enable()