Update plugin kover to v0.9.9

[juul-mobile-bot]

This PR contains the following updates:

Package	Type	Update	Change
org.jetbrains.kotlinx.kover	plugin	patch	0.9.8 → 0.9.9

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Note

Low Risk
Single-line tooling version bump with no application or build logic changes beyond the plugin version.

Overview
Bumps the Kotlin Kover Gradle plugin from 0.9.8 to 0.9.9 in gradle/libs.versions.toml. The plugin stays wired the same way on the root project and koap-core, and CI still runs koverXmlReport for coverage.

^{Reviewed by Cursor Bugbot for commit 98c040e. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.04%. Comparing base (0375ae6) to head (98c040e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #448   +/-   ##
=======================================
  Coverage   69.04%   69.04%           
=======================================
  Files           9        9           
  Lines         798      798           
  Branches      217      217           
=======================================
  Hits          551      551           
  Misses        161      161           
  Partials       86       86           

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