Fix CI

[neilfordyce]

Description

Version bumps to fix CI. To run on a supported runner (ubuntu-22.04) and a supported version of go (v1.21).

Upgrading to Go v1.22 requires further investigation. It currently results in a panic with "encoding alphabet includes duplicate symbols". Imagine it's due to some outdated dependency, because I can't see any where we're calling base64.NewEncoding directly.

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Checklist:

• [x] This contribution follows the project's code of conduct
• [x] This contribution follows the project's contributing guidelines
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules