Remove circular dependency in art.estimators.certification

[beat-buesser]

Description

This pull request removes a circular dependency in art.estimators.certification.

Fixes #2234

Type of change

Please check all relevant options.

• Improvement (non-breaking)
• Bug fix (non-breaking)
• New feature (non-breaking)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

[codecov-commenter]

Codecov Report

Merging #2241 (cc5a28b) into dev_1.15.1 (509e223) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Your organization is not using the GitHub App Integration. As a result you may experience degraded service beginning May 15th. Please install the Github App Integration for your organization. Read more.

@@             Coverage Diff             @@
##           dev_1.15.1    #2241   +/-   ##
===========================================
  Coverage       85.61%   85.62%           
===========================================
  Files             308      308           
  Lines           27450    27464   +14     
  Branches         5045     5045           
===========================================
+ Hits            23502    23516   +14     
  Misses           2668     2668           
  Partials         1280     1280           

Files Changed	Coverage Δ
art/estimators/certification/__init__.py	100.00% <100.00%> (ø)

[GiulioZizzo]

Hi Beat, thanks for the review and tracking down this problem! Looks good to merge for me.