Fixes tests after refactor of `fileformats.generic.File` into `BinaryFile` and `UnicodeFile`

[tclose]

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Summary

Update to the fileformats dependency to add support for static type checking broke a couple of tests (not the code-base itself). This PR fixes those tests.

Checklist

• [x] I have added tests to cover my changes (if necessary)
• [x] I have updated documentation (if necessary)

[tclose]

@djarecka this is just a minor PR that needs to merged in for the master branch to pass the tests. Do you mind if I do it myself? The only changes are cleaning up some typing and the use of BinaryFile and raw_contents instead of File and contents in a couple of tests

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #764   +/-   ##
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  Coverage        ?   89.11%           
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  Files           ?       55           
  Lines           ?    15789           
  Branches        ?     1379           
=======================================
  Hits            ?    14070           
  Misses          ?     1717           
  Partials        ?        2           

Flag	Coverage Δ
unittests	89.16% <100.00%> (?)

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