Pin dependencies in ci.yml

[fxamacker]

Changes

• Pin dependencies:
  • actions/setup-go
  • actions/checkout
• Bump go versions to go-1.19 and go-1.20.

---

• [x] Targeted PR against main branch
• [ ] Linked to Github issue with discussion and accepted design OR link to spec that describes this work
• [x] Code follows the standards mentioned here
• [ ] Updated relevant documentation
• [x] Re-reviewed Files changed in the Github PR explorer
• [x] Added appropriate labels

[codecov-commenter]

Codecov Report

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

Comparison is base (1e6ec55) 64.93% compared to head (9cd2483) 64.95%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #367 +/- ## ========================================== + Coverage 64.93% 64.95% +0.02% ========================================== Files 14 14 Lines 8811 8811 ========================================== + Hits 5721 5723 +2 + Misses 2356 2354 -2 Partials 734 734 ```

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