Bump KSP

[alexander-yevsyukov]

This PR migrates to newer version of KSP Gradle Plugin as the runtime dependency. The code was adjusted to adopt the type change in from Property<File> to DirectoryProperty in the KSP plugin extension.

The project is still built with the previous version of KSP Gradle Plugin.

[Copilot]

Pull Request Overview

This PR updates the KSP (Kotlin Symbol Processing) Gradle Plugin from version 2.1.21-2.0.1 to 2.2.20-2.0.4 as a runtime dependency, while maintaining the previous version for the build process through a new dogfoodingVersion property.

Key changes:

• Updated KSP dependency version to 2.2.20-2.0.4 in runtime dependencies
• Introduced dogfoodingVersion property to preserve 2.1.21-2.0.1 for build-time usage
• Adapted code to handle API changes in the newer KSP version

Reviewed Changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
version.gradle.kts	Bumped project version from 017 to 018
pom.xml	Updated KSP runtime dependencies and moved auto-service-annotations scope from provided to compile
ksp/src/main/kotlin/io/spine/tools/core/jvm/ksp/gradle/KspBasedPlugin.kt	Adapted to KSP API changes: replaced Property<File> with DirectoryProperty and updated path handling
ksp/src/test/kotlin/io/spine/tools/core/jvm/ksp/gradle/KspBasedPluginTest.kt	Updated test to use .asFile for accessing file paths
buildSrc/src/main/kotlin/io/spine/dependency/build/Ksp.kt	Added dogfoodingVersion property and updated main version
buildSrc/src/main/kotlin/BuildExtensions.kt	Modified to use dogfoodingVersion for build-time KSP plugin
buildSrc/src/main/kotlin/io/spine/dependency/local/CoreJvmCompiler.kt	Updated internal version references to 017
buildSrc/src/main/kotlin/io/spine/dependency/Dependency.kt	Enhanced artifact() method to accept optional version parameter
dependencies.md	Updated dependency documentation with new KSP versions
config	Updated subproject commit reference

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}