CODEOWNERS: Become a typing code owner (GH-98480)

(cherry picked from commit cb93b4a)

Co-authored-by: Alex Waygood <[email protected]>

Author: miss-islington

.github/CODEOWNERS

@@ -133,7 +133,7 @@ Lib/ast.py                    @isidentical
 
 **/*idlelib*                  @terryjreedy
 
-**/*typing*                   @gvanrossum @Fidget-Spinner @JelleZijlstra
+**/*typing*                   @gvanrossum @Fidget-Spinner @JelleZijlstra @AlexWaygood
 
 **/*asyncore                  @giampaolo
 **/*asynchat                  @giampaolo