Relax mautrix-whatsapp regex in registration file to match what mautrix-whatsapp v0.12.0 expects

Since mautrix-whatsapp v0.12.0, the bridge deals with more than just phone numbers now,
so it sometimes tries to manage users with Matrix IDs like: `@whatsapp_lid-123456789:example.com`

Ref:

- https://github.com/mautrix/whatsapp/releases/tag/v0.12.0
- https://mau.fi/blog/2025-04-mautrix-release/

roles/custom/matrix-bridge-mautrix-whatsapp/defaults/main.yml

@@ -226,7 +226,7 @@ matrix_mautrix_whatsapp_registration_yaml: |
   rate_limited: false
   namespaces:
       users:
-      - regex: '^@whatsapp_[0-9]+:{{ matrix_mautrix_whatsapp_homeserver_domain | regex_escape }}$'
+      - regex: '^@whatsapp_.*:{{ matrix_mautrix_whatsapp_homeserver_domain | regex_escape }}$'
         exclusive: true
       - exclusive: true
         regex: '^@{{ matrix_mautrix_whatsapp_appservice_bot_username | regex_escape }}:{{ matrix_mautrix_whatsapp_homeserver_domain | regex_escape }}$'