Update to latest snapshot to support transient 0.9.2+
A recent update of transient breaks its interface and the latest snapshot of rg.el is updated to be compatible and requires (transient "0.9.2")
.
This MR updates to this snapshot and provides other QoL changes (the temporary upstream tag is upstream/2.3.0+git20250625.7611852b and already pushed).
This is intended for experimental as transient 0.9.3-1~exp1 is currently in experimental only for now.