Specify encoding when converting hex-bytestring to string

[oddstr13]

Fixes im85288/service.upnext#313

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 21.50%. Comparing base (a8982d2) to head (859a393).
Report is 5 commits behind head on master.

Files	Patch %	Lines
jellyfin_kodi/helper/utils.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #899   +/-   ##
=======================================
  Coverage   21.50%   21.50%           
=======================================
  Files          63       63           
  Lines        8632     8632           
  Branches     1585     1585           
=======================================
  Hits         1856     1856           
  Misses       6755     6755           
  Partials       21       21           

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