fix: mapping values are not allowed here in Quickstart.yml

[ThibHrrd]

ERROR: "yaml.scanner.ScannerError: mapping values are not allowed here"

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
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• I confirm that this pull request does not address a security
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• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

Just a small YAML error on line 22 because of an extra ":".

[CLAassistant]

All committers have signed the CLA.

[aeneasr]

Thank you for bringing this to our attention! I saw that there are some issues with the Dockerfiles and resolved them in the patch, and also addressed the issue you described in this PR :)

[ThibHrrd]

Thank you for bringing this to our attention! I saw that there are some issues with the Dockerfiles and resolved them in the patch, and also addressed the issue you described in this PR :)

no problem! :))