Upgrade to scraperlib v3.4.0 to use VP9

[benoit74]

Partial implementation of #235

• partial because this PR is an update on the v2 branch since v3 is not yet ready
• this also needs to be backported to main branch as well
• tests done
  • run again the scraper => all videos are reencoded with VP9 and reuploaded to cache
  • run again the scraper a second time => all videos are downloaded from cache and are encoded with VP9
• also implement bootstrap v1.0.2 (fixes to code coverage upload)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@         Coverage Diff          @@
##             v2    #236   +/-   ##
====================================
  Coverage      ?   1.78%           
====================================
  Files         ?      10           
  Lines         ?     954           
  Branches      ?     158           
====================================
  Hits          ?      17           
  Misses        ?     937           
  Partials      ?       0           

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[rgaudin]

LGTM