feat: Update RooFitExtensions to v1.0.2 (!39)

Matthew Feickertrequested to merge
feat/update-roofitextensions-to-v1.0.2 into master

Update RooFitExtensions to v1.0.2 to avoid build errors with ROOT v6.24.00 and later.

Resolves atlas_higgs_combination/software/RooFitExtensions#7 (closed)

* Update RooFitExtensions to tag v1.0.2
   - c.f. https://gitlab.cern.ch/atlas_higgs_combination/software/RooFitExtensions/-/tags/v1.0.2
   - Required for use with ROOT v6.24.00+
Edited by Matthew Feickert

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