Remove FRR release pin from the EVPN EBGP integration test

The EVPN attribute removal bug has been fixed in 10.4.1 and 10.3.2.
There's no longer any need to pin FRR release.

Author: ipspace

tests/integration/evpn/13-vxlan-ebgp-allowas.yml

@@ -24,7 +24,6 @@ groups:
     members: [ l2, spine ]
     device: frr
     provider: clab
-    clab.image: quay.io/frrouting/frr:10.2.2
 
 vlans:
   red: