Use IOUtils to read all bytes of a resource

[uhafner]

See https://stackoverflow.com/questions/10812559/how-to-load-a-classpath-resource-to-an-array-of-byte#comment123061315_50852924.

[codecov-commenter]

Codecov Report

Merging #529 (3aafbf0) into main (462a56a) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main     #529   +/-   ##
=========================================
  Coverage     89.83%   89.83%           
  Complexity       98       98           
=========================================
  Files             9        9           
  Lines           354      354           
  Branches         50       50           
=========================================
  Hits            318      318           
  Misses           29       29           
  Partials          7        7           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 462a56a...3aafbf0. Read the comment docs.