Re-use possibly cached postgis_version from pgsql description method #47393
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While trying to fix multiple
postgis_version()queries from DBManager TopoViewer plugin I spotted code in qgspostgresprovider.cpp locally callingpostgis_version()rather than fetching that info from the QgsPostgresConn associated object (which is possibly cached).This change does NOT fix #47391 but seems to be a good change to me, in general (reduces code duplication).