auth-backend-module-okta-provider: add "additionalScopes" to config schema

Signed-off-by: Michał Prokopowicz <michael.prokopowicz@gmail.com>

.changeset/brown-items-hammer.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-auth-backend-module-okta-provider': patch
+---
+
+Added missing "additionalScopes" option to configuration schema.

plugins/auth-backend-module-okta-provider/config.d.ts

@@ -29,6 +29,7 @@ export interface Config {
           authServerId?: string;
           idp?: string;
           callbackUrl?: string;
+          additionalScopes?: string;
         };
       };
     };