[Explore] Fix lint error by updating field overrides tests (#64754)

Fix type error in fieldOverrides.test.ts

packages/grafana-data/src/field/fieldOverrides.test.ts

@@ -696,7 +696,7 @@ describe('getLinksSupplier', () => {
               },
             ],
           },
-          display: (v) => ({ numeric: v, text: String(v) }),
+          display: (v) => ({ numeric: Number(v), text: String(v) }),
         },
       ],
     });