pg_dump 17 and later adds SET transaction_timeout = 0 to dumps, but
the parameter only exists on PostgreSQL 17+ servers. Restoring such a
dump on PostgreSQL 16 or older fails with:
psql failed: ERROR: unrecognized configuration parameter "transaction_timeout"
This is easy to hit because postgres client tools are commonly newer
than the server they talk to (the discourse_docker base image ships
the latest client alongside the default version, and pg_dump resolves
to the newest one installed), so backups can quietly become
un-restorable on the server that created them.
Strip the line during restore like the other version-specific SQL in
the unwanted_sql list.
7c03546b89
