Fixed vendor type in generate pe inventory.

gso/workflows/router/update_ibgp_mesh.py

@@ -64,7 +64,7 @@ def _generate_pe_inventory(pe_router_list: list[Router]) -> dict[str, Any]:
                 router.router.router_fqdn: {
                     "lo4": str(router.router.router_lo_ipv4_address),
                     "lo6": str(router.router.router_lo_ipv6_address),
-                    "vendor": router.router.vendor,
+                    "vendor": str(router.router.vendor),
                 }
                 for router in pe_router_list
             }