Track project version in ":kotlin-gradle-plugin:processResources"

Before the change consecutive incremental builds with different project versions
produced kotlin-gradle-plugin with the same project.version in project.properties file

libraries/tools/kotlin-gradle-plugin/build.gradle

@@ -106,7 +106,9 @@ sourceSets {
 compileAgp25Kotlin.dependsOn compileGroovy
 
 processResources {
-    expand(project.properties)
+    def props = ["projectVersion" : project.version]
+    inputs.properties(props)
+    expand(props)
 }
 
 jar.dependsOn agp25Classes

libraries/tools/kotlin-gradle-plugin/src/main/resources/project.properties

@@ -1 +1 @@
-project.version=${project.version}
+project.version=${projectVersion}