Ensure target_file returns utf-8 files

[jmthomas]

closes #1793

[codecov]

Codecov Report

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 79.56%. Comparing base (fb1a8ad) to head (61165ed).

Files with missing lines	Patch %	Lines
openc3/lib/openc3/utilities/target_file.rb	16.66%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1853      +/-   ##
==========================================
- Coverage   79.57%   79.56%   -0.02%     
==========================================
  Files         519      519              
  Lines       40774    40778       +4     
==========================================
- Hits        32447    32446       -1     
- Misses       8327     8332       +5     

Flag	Coverage Δ
python	84.31% <ø> (-0.01%)	⬇️
ruby-api	48.72% <ø> (ø)
ruby-backend	82.56% <16.66%> (-0.02%)	⬇️

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[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 SonarQube Cloud