fix: if both layers python3_ia and python3_scientific are available, python3_scientific is loaded by default (backport #1203) (#1204)

This is an automatic backport of pull request #1203 done by [Mergify](https://mergify.io).


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Author: mergify[bot]

layers/layer9_default/.layerapi2_dependencies

@@ -5,8 +5,8 @@ core@mfext
 -scientific_core@mfext
 python3@mfext
 -scientific@mfext
--python3_scientific@mfext
 -python3_ia@mfext
+-python3_scientific@mfext
 -python3_mapserverapi@mfext
 -python3_vim@mfext
 -python3_devtools@mfext