v0.4.11: Remove dependency on deprecated conventions API (#54)

`Project.convention` and other conventions API methods have been
deprecated and will be removed in Gradle 9.0. To make things worse, the
`Project.convention.plugins["java"]` does not return
`DefaultJavaPluginConvention` anymore, but instead returns a wrapper
class that issues deprecation warnings. Since the plugin cannot find the
expected class, it stopped working properly (this is probably the cause
of #53).

This pull requests simply replaces the single use of
`Project.convention.plugins[]` (finding the Java test sourceset) with
`Project.extensions.findByType`.

Fixes: #42, #53

v0.4.0

What's Changed

• Updating Kotest to 5.5.5
• Updating to Kotlin 1.6.10
• Update from TaycanReporter to EnhancedConsoleTestEngineListener by @rezammalik in #46

New Contributors

• @rezammalik made their first contribution in #46

Full Changelog: https://github.com/kotest/kotest-gradle-plugin/commits/v0.4.0