Add downgrade CI for testing lower bounds

[codecov[bot]]

Codecov Report

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

Comparison is base (84602f3) 41.82% compared to head (16a459e) 29.08%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #553 +/- ## =========================================== - Coverage 41.82% 29.08% -12.75% =========================================== Files 53 53 Lines 4155 4147 -8 =========================================== - Hits 1738 1206 -532 - Misses 2417 2941 +524 ```

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