bug fix in transpose_event

Maarten Van Veghelrequested to merge
mveghel-transpose_event-bugfix into master

Fixes heap buffer overflow caused by https://gitlab.cern.ch/lhcb/Allen/-/blob/master/main/src/Transpose.cpp. Cherry picked commit from MR (? @thboettc @raaij):

  • commit message: Resize slice fragment when data is too large

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