[3.13] gh-97850: Suggest `TraversableResources` as the alternative for `ResourceLoader` (GH-128601) (GH-128895)

gh-97850: Suggest `TraversableResources` as the alternative for `ResourceLoader` (GH-128601)

Suggest TraversableResources as the alternative for ResourceLoader.

Previously, ResourceReader was the suggested alternative, but it
is itself deprecated in favour of TraversableResources.
(cherry picked from commit 256d6d2131541b3ff8f06f42c8157f808fde464c)

Co-authored-by: Tomas R <tomas.roun8@gmail.com>