Use scraperlib 5.0.0rc4

[benoit74]

Changes:

• move to scraperlib 5.0.0rc4 (and adapt code accordingly)
• activate strict type checking (needing few type hints + ignore)
• cleanup unused classes around license generation
• make test of Wikimedia User-Agent more exact/permissive

[codecov]

Codecov Report

Attention: Patch coverage is 71.42857% with 4 lines in your changes missing coverage. Please review.

Project coverage is 51.01%. Comparing base (9b861f5) to head (ddb65ca).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
scraper/src/mindtouch2zim/asset.py	60.00%	2 Missing ⚠️
scraper/src/mindtouch2zim/client.py	0.00%	1 Missing ⚠️
scraper/src/mindtouch2zim/processor.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #125      +/-   ##
==========================================
- Coverage   51.58%   51.01%   -0.58%     
==========================================
  Files          20       20              
  Lines        1196     1182      -14     
  Branches      137      137              
==========================================
- Hits          617      603      -14     
  Misses        566      566              
  Partials       13       13              

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[rgaudin]

LGTM