chore(ci): stopping properly HTTP/2 server

Raphael Defosseuxrequested to merge
fix-http2-shutdown into develop
  • bump-up of nghttp2 --> see common-build MR
  • bump-up of ci-scripts/common
  • stopping properly the task manager

now, with this 1st commit, we faced the frequent seg fault due to parallel calls to server.join()

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