plugins: use convertLegacyRouteRefs

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

plugins/tech-radar/src/alpha.tsx

@@ -27,6 +27,7 @@ import { SampleTechRadarApi } from './sample';
 import {
   compatWrapper,
   convertLegacyRouteRef,
+  convertLegacyRouteRefs,
 } from '@backstage/core-compat-api';
 import { rootRouteRef } from './plugin';
 
@@ -61,7 +62,7 @@ export const techRadarApi = createApiExtension({
 export default createPlugin({
   id: 'tech-radar',
   extensions: [techRadarPage, techRadarApi],
-  routes: {
-    root: convertLegacyRouteRef(rootRouteRef),
-  },
+  routes: convertLegacyRouteRefs({
+    root: rootRouteRef,
+  }),
 });