Upgrade Synapse (1.46.0 -> 1.47.0)

We had to remove UID/GID environment variables that we used to pass
to the Synapse container, because it was causing a problem after
https://github.com/matrix-org/synapse/pull/11209

We were using both `--user` and UID/GID environment variables until now.

roles/matrix-synapse/templates/synapse/systemd/matrix-synapse.service.j2

@@ -33,8 +33,6 @@ ExecStartPre={{ matrix_host_command_sleep }} 3
 ExecStart={{ matrix_host_command_docker }} run --rm --name matrix-synapse \
 			--log-driver=none \
 			--user={{ matrix_user_uid }}:{{ matrix_user_gid }} \
-			--env=UID={{ matrix_user_uid }} \
-			--env=GID={{ matrix_user_gid }} \
 			--cap-drop=ALL \
 			--read-only \
 			--tmpfs=/tmp:rw,noexec,nosuid,size={{ matrix_synapse_tmp_directory_size_mb }}m \