Update to FHist 0.11 series

[graeme-a-stewart]

This adapts to the FHist 0.11 API, that defines binedges, rather than bins.

N.B. this means losing compatibility with FHist = "0.10".

Tests are running ok, but I don't know if the histograms are exercised fully.

Fixes #8.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 77.77%. Comparing base (cb13d03) to head (284da1b).

Files with missing lines	Patch %	Lines
src/Histograms.jl	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main       #9   +/-   ##
=======================================
  Coverage   77.77%   77.77%           
=======================================
  Files           7        7           
  Lines         477      477           
=======================================
  Hits          371      371           
  Misses        106      106           

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[peremato]

Thanks for the changes!