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object Updates the definition and parameters of the coordinate reference system to their latest values. This only has an effect if the CRS is a user defined custom CRS, and the definition of that custom CRS has changed. In this case the parameters of the object (such as the proj and WKT string definitions, and other related properties) will be updated to reflect the current definition of the custom CRS. Any objects which store CRS objects should connect to the QgsApplication::coordinateReferenceSystemRegistry()'s QgsCoordinateReferenceSystemRegistry::userCrsChanged() signal and call this method on their stored CRS objects whenever the signal is emitted in order to update these CRSes to their new definitions. Refs #40704