BUGFIX: ci image to include go

[mattclegg]

circle-ci is using a deprecated image 'ubuntu-2004:202201-02'.

Proposed Changes

cimg/go is a Docker image created by CircleCI with continuous integration builds in mind. Each tag contains a complete Go version and toolchain, the testing wrapper gotestsum, and any binaries and tools that are required for builds to complete successfully in a CircleCI environment.

Checklist

• [x] Rebased/mergeable
• [ ] Tests pass (unable to test from PR)
• [x] Commit messages are in semantic format
• [x] Sign CLA (if not already signed)