Fix SourceAv in function 'flatbuffers::ReadScalar'

[rascani]

Differential Revision: D112525269

[pytorch-bot]

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❌ 1 New Failure

As of commit 3a64f90 with merge base abdc92d ():

NEW FAILURE - The following job has failed:

• Lint / lintrunner (gh)
  >>> Lint for extension/flat_tensor/flat_tensor_data_map.cpp:

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