ci: fix id-token 'read' bug (#2904)

This commit fixes a bug that is present when the `read` option is used
for the `id-token` permission (see https://github.com/github/docs/issues/26481).

.github/workflows/generate-theme-doc.yml

@@ -11,7 +11,6 @@ permissions:
   checks: read
   contents: write
   deployments: read
-  id-token: read
   issues: read
   discussions: read
   packages: read