Fix python issue caused by ROOT 6.22

Simulation/ISF/ISF_Core/FaserISF_Services/python/FaserISF_ServicesConfigNew.py

@@ -87,9 +87,12 @@ def FaserTruthServiceCfg(ConfigFlags, name="FaserISF_TruthService", **kwargs):
     kwargs.setdefault('SkipIfNoChildren', True)
     kwargs.setdefault('SkipIfNoParentBarcode', True)
 
-    import ROOT, cppyy
-    cppyy.loadDictionary('FaserDetDescrDict')
-    FaserRegion = ROOT.FaserDetDescr
+    import PyUtils.RootUtils as rootUtils
+    ROOT = rootUtils.import_root()
+
+    import cppyy
+    cppyy.load_library('FaserDetDescrDict')
+    from ROOT.FaserDetDescr import FaserRegion
 
     kwargs.setdefault('ForceEndVtxInRegions', [FaserRegion.fFaserNeutrino,
                                                FaserRegion.fFaserScintillator,