Use Go version 1.23rc1 in CI

[BooleanCat]

Please provide a brief description of the change.

In preparation for this working in go 1.23 without experimental features, run in CI using rc1.

Which issue does this change relate to?

None

Contribution checklist.

• [x] I have read and understood the CONTRIBUTING guidelines
• [x] My code is formatted (make check)
• [x] I have run tests (make test)
• [x] All commits in my PR conform to the commit hygiene section
• [x] I have added relevant tests
• [x] I have not added any dependencies

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.78%. Comparing base (33b266d) to head (382507c).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## v2 #111 +/- ## =========================================== - Coverage 100.00% 93.78% -6.22% =========================================== Files 18 16 -2 Lines 342 322 -20 =========================================== - Hits 342 302 -40 - Misses 0 10 +10 - Partials 0 10 +10 ```

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[BooleanCat]

Accepting with less than 100% coverage as this will be resolved when future is removed.