CompatHelper: bump compat for DynamicExpressions in [weakdeps] to 0.18, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the DynamicExpressions package from 0.16, 0.17 to 0.16, 0.17, 0.18. This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry. It is your responsibility to make sure that your package tests pass before you merge this pull request.

[codecov[bot]]

Codecov Report

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

Project coverage is 97.01%. Comparing base (a2e113c) to head (f50ef89).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #728 +/- ## ========================================== + Coverage 96.89% 97.01% +0.11% ========================================== Files 53 53 Lines 2708 2710 +2 ========================================== + Hits 2624 2629 +5 + Misses 84 81 -3 ```

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