Remove `matrix_synapse_ext_synapse_auto_accept_invite_version`

Signed-off-by: Suguru Hirahara <did🔑z6MkvVZk1A3KBApWJXv2Ju4H14ErDfRGxh8zxdXSZ4vACDg5>

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

@@ -1551,7 +1551,6 @@ matrix_synapse_ext_synapse_s3_storage_provider_migrate_systemd_wanted_services_l
 # See: https://github.com/matrix-org/synapse-auto-accept-invite
 # Installing it requires building a customized Docker image for Synapse (see `matrix_synapse_container_image_customizations_enabled`).
 # Enabling this will enable customizations and inject the appropriate Dockerfile clauses for installing synapse-auto-accept-invite.
-matrix_synapse_ext_synapse_auto_accept_invite_version: 1.1.3
 # Specifies whether only invites from local users will be auto accepted.
 matrix_synapse_ext_synapse_auto_accept_invite_accept_invites_only_from_local_users: false