gh-72719: Remove asyncore and asynchat modules (#96580)

Remove modules asyncore and asynchat, which were deprecated by PEP 594.

Co-authored-by: Jelle Zijlstra <[email protected]>

Author: sobolevn

.github/CODEOWNERS

@@ -137,8 +137,6 @@ Lib/ast.py                    @isidentical
 
 **/*typing*                   @gvanrossum @Fidget-Spinner @JelleZijlstra @AlexWaygood
 
-**/*asyncore                  @giampaolo
-**/*asynchat                  @giampaolo
 **/*ftplib                    @giampaolo
 **/*shutil                    @giampaolo