Add Ahmed Hassanin as approver

Ahmed was now a reviewer in this working group for more than 9 month and contributed and review a lot of PRs. Further we joins the WG meetings regularly and try to catch up with all changes in the community.

Author: max-soe

toc/working-groups/foundational-infrastructure.md

@@ -238,9 +238,9 @@ areas:
     github: selzoc
   - name: Matthias Vach
     github: mvach
-  reviewers:
   - name: Ahmed Hassanin
     github: a-hassanin
+  reviewers:
   - name: Ansh Rupani
     github: anshrupani
   repositories: