fix(server): make scope field optional in access token response (#8753)

Co-authored-by: DarkSky <25152247+darkskygit@users.noreply.github.com>

packages/backend/server/src/plugins/oauth/providers/oidc.ts

@@ -14,7 +14,7 @@ const OIDCTokenSchema = z.object({
   access_token: z.string(),
   expires_in: z.number(),
   refresh_token: z.string(),
-  scope: z.string(),
+  scope: z.string().optional(),
   token_type: z.string(),
 });