feat: update to go 1.21

[dirien]

Thank you for making minectl 🗺 better

Please reference the issue this PR is fixing.

Also verify you have:

• [ ] Read the contributions page.
• [ ] Read the DCO, if you are a first time contributor.
• [ ] Read the code of conduct.

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

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[github-actions[bot]]

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.