Bump devfile version to 0.0.20

Hunar Khannarequested to merge
hkhanna2_upgrade_gem_0.0.20 into main

Issue: gitlab-org/gitlab#418874 (closed)

What does this MR do

  • Bumps the version in devfile.gemspec to 0.0.20-alpha1
  • The gem will be published after this MR is merged into main
Edited by Hunar Khanna

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