Django migration ordering bug in authentik 2026.2.0 — rbac/0010 (drops
Role.group_id) can execute before core/0056 (data migration that reads
Role.group_id), causing FieldError on startup. Add explicit dependency
via substituteInPlace. Upstream: goauthentik/authentik#19616
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>