Remove a warning message of PedAnovaImportanceEvaluator

[c-bata]

Contributor License Agreement

This repository (optuna-dashboard) and Goptuna share common code.
This pull request may therefore be ported to Goptuna.
Make sure that you understand the consequences concerning licenses and check the box below if you accept the term before creating this pull request.

• I agree this patch may be ported to Goptuna by other Goptuna contributors.

Reference Issues/PRs

Refs #820

What does this implement/fix? Explain your changes.

Remove a warning message since it isn't a problem to use Optuna Dashboard with optuna<3.6.0.

[nabenabe0928]

Thank you for addressing the issue, probably it is better removing it to avoid complications.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.60%. Comparing base (7708a1f) to head (dbec8c6).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #823      +/-   ##
==========================================
- Coverage   69.61%   69.60%   -0.02%     
==========================================
  Files          35       35              
  Lines        2376     2375       -1     
==========================================
- Hits         1654     1653       -1     
  Misses        722      722              

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[c-bata]

@nabenabe0928 Thank you for your review!

[c-bata]

Let me merge this PR, since the cause of CI failure is obviously not related to this PR.