v1.21.0

Changelog

• dbdf2c5 Merge pull request #603 from labd/dependabot/github_actions/github-actions-a331d3ec2d
• fdd5075 Merge pull request #604 from labd/dependabot/go_modules/go-ea51fc25e8
• 177b995 Merge pull request #608 from labd/602-error-timeoutinms-must-be-0
• afab6c4 Merge pull request #610 from labd/606-project-update-inconsistent-plan
• f0cd33b Merge pull request #611 from labd/release/v1.21.0
• b5908f0 Release v1.21.0
• 91af445 chore(deps): bump actions/checkout in the github-actions group
• ba2d605 chore(deps): bump the go group across 1 directory with 3 updates
• 7683dba feat: Updated various commercetools projects settings. Made change management more robust
• 33f0d75 feat: fixed tests
• 973d40e fix: added default for timeout_in_ms on commercetools_api_extension