CompatHelper: add new compat entry for Plots at version 1 for package docs, (keep existing compat)

[github-actions[bot]]

This pull request sets the compat entry for the Plots package to 1 for package docs. 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. Note: Consider registering a new release of your package immediately after merging this PR, as downstream packages may depend on this for tests to pass.

[codecov-commenter]

Codecov Report

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

Comparison is base (062e821) 99.60% compared to head (44949c8) 99.60%. Report is 1 commits behind head on main.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #14 +/- ## ======================================= Coverage 99.60% 99.60% ======================================= Files 3 3 Lines 255 255 ======================================= Hits 254 254 Misses 1 1 ```

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