chore: Upgrade kover to 0.9.1

[mattcreaser]

• PR conforms to Pull Request guidelines.

Issue #, if available:

Description of changes:
Upgrades the Kover plugin to 0.9.1

How did you test these changes?
Coverage reports should still work on this PR.

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Ensure commit message has the appropriate scope (e.g fix(liveness): message, fix(authenticator): message, fix(all): message)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.15%. Comparing base (641b61a) to head (5e34eef).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #238      +/-   ##
==========================================
+ Coverage   26.11%   29.15%   +3.03%     
==========================================
  Files          95       94       -1     
  Lines        4468     4377      -91     
  Branches      869      510     -359     
==========================================
+ Hits         1167     1276     +109     
+ Misses       3109     2994     -115     
+ Partials      192      107      -85     

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