docs(stack-overflow): update api reports

Signed-off-by: Camila Belo <camilaibs@gmail.com>

plugins/stack-overflow/alpha-api-report.md

@@ -3,10 +3,12 @@
 > Do not edit this file. It is a report generated by [API Extractor](https://api-extractor.com/).
 
 ```ts
+import { AnyExternalRoutes } from '@backstage/core-plugin-api';
+import { AnyRoutes } from '@backstage/core-plugin-api';
 import { BackstagePlugin } from '@backstage/frontend-plugin-api';
 
 // @alpha (undocumented)
-const _default: BackstagePlugin;
+const _default: BackstagePlugin<AnyRoutes, AnyExternalRoutes>;
 export default _default;
 
 // (No @packageDocumentation comment for this package)