Support new robot 7.4 secret variables as part of auth params

[oboehmer]

resolves #410

[codecov]

Codecov Report

❌ Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 89.06%. Comparing base (19c9017) to head (b0b5d6d).

Files with missing lines	Patch %	Lines
src/RequestsLibrary/SessionKeywords.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #411      +/-   ##
==========================================
+ Coverage   85.38%   89.06%   +3.68%     
==========================================
  Files           9        9              
  Lines         479      494      +15     
  Branches       49       51       +2     
==========================================
+ Hits          409      440      +31     
+ Misses         65       52      -13     
+ Partials        5        2       -3     

Flag	Coverage Δ
acceptance	85.62% <94.73%> (+0.24%)	⬆️
unit	60.72% <73.68%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[oboehmer]

@lucagiove . Can you please review this PR? Would be great to have this available once rf7.4 is released