Whitelist 2 more APIs for Synapse workers

Related to:

- e55269e14f
- 3d70cc393f
- 4fc85e5a92

roles/custom/matrix-synapse/vars/main.yml

@@ -178,7 +178,9 @@ matrix_synapse_workers_generic_worker_endpoints:
   # Registration/login requests
   - ^/_matrix/client/(api/v1|r0|v3|unstable)/login$
   - ^/_matrix/client/(r0|v3|unstable)/register$
+  - ^/_matrix/client/(r0|v3|unstable)/register/available$
   - ^/_matrix/client/v1/register/m.login.registration_token/validity$
+  - ^/_matrix/client/(r0|v3|unstable)/password_policy$
 
   # Event sending requests
   - ^/_matrix/client/(api/v1|r0|v3|unstable)/rooms/.*/redact