Clear up maximum_tries/maximum_retries for robust method

[EddyCMWF]

Description

Contributor Declaration

By opening this pull request, I affirm the following:

• All authors agree to the Contributor License Agreement.
• The code follows the project's coding standards.
• I have performed self-review and added comments where needed.
• I have added or updated tests to verify that my changes are effective and functional.
• I have run all existing tests and confirmed they pass.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 33.33333% with 16 lines in your changes missing coverage. Please review.

Project coverage is 14.33%. Comparing base (f53e543) to head (b94b153).
Report is 17 commits behind head on develop.

Files with missing lines	Patch %	Lines
multiurl/http.py	0.00%	15 Missing ⚠️
multiurl/__init__.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #33      +/-   ##
===========================================
+ Coverage    13.91%   14.33%   +0.42%     
===========================================
  Files           14       14              
  Lines         1042     1060      +18     
===========================================
+ Hits           145      152       +7     
- Misses         897      908      +11     

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