Revert "[ci] Disable TMVA on Alma8"

This reverts commit ebab348.

Author: lmoneta

.github/workflows/root-ci-config/buildconfig/alma8.txt

@@ -3,10 +3,5 @@ builtin_nlohmannjson=ON
 builtin_tbb=ON
 builtin_vdt=On
 fortran=OFF
-tmva=OFF
-tmva-cpu=OFF
-tmva-gpu=OFF
-tmva-pymva=OFF
-tmva-rmva=OFF
-tmva-sofie=OFF
+tmva-sofie=On
 ccache=On