Quick fixes 4.x

[kmvanbrunt]

• Fixed ArgparseCompleter.print_help() not passing file stream to recursive call.
• Fixed issue where constants.REDIRECTION_TOKENS was being mutated.

Fixes #1649

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.49%. Comparing base (0abaeab) to head (b7376b3).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1651      +/-   ##
==========================================
+ Coverage   99.47%   99.49%   +0.01%     
==========================================
  Files          21       21              
  Lines        4759     4747      -12     
==========================================
- Hits         4734     4723      -11     
+ Misses         25       24       -1     

Flag	Coverage Δ
unittests	99.49% <100.00%> (+0.01%)	⬆️

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