fix: resolve valueof(GradlePropertyValueSource) in artifact filename

- Update IntelliJ Platform Gradle Plugin from 2.13.1 to 2.16.0
- Work around Gradle 9.0 Provider resolution bug where the plugin sets
  project.version to an unresolved Provider whose toString() returns
  "valueof(GradlePropertyValueSource)" instead of the actual version
- afterEvaluate restores project.version to the resolved string so
  buildPlugin creates GoAOPPlugin-2.0.0.zip instead of the broken name

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: lisachenko

build.gradle.kts

@@ -16,7 +16,18 @@ plugins {
 }
 
 group = properties("pluginGroup").get()
-version = properties("pluginVersion").get()
+
+// Work around Provider resolution issue in IntelliJ Platform Gradle Plugin with Gradle 9.0:
+// the plugin sets project.version to an unresolved Provider whose toString() yields
+// "valueof(GradlePropertyValueSource)" instead of the actual version string.
+// afterEvaluate overrides it back to a plain String so the artifact filename is correct.
+val pluginVer: String = file("gradle.properties").readLines()
+    .first { it.startsWith("pluginVersion") }
+    .substringAfter("= ")
+    .trim()
+afterEvaluate {
+    version = pluginVer
+}
 
 repositories {
     mavenCentral()
@@ -133,7 +144,7 @@ tasks {
     }
 
     patchPluginXml {
-        version = properties("pluginVersion")
+        version = pluginVer
         sinceBuild = properties("pluginSinceBuild")
         untilBuild = provider { null }
 

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ mockitoKotlin = "5.4.0"
 # plugins
 kotlin = "2.2.0"
 changelog = "2.2.0"
-intellijPlatformGradle = "2.13.1"
+intellijPlatformGradle = "2.16.0"
 qodana = "2023.3.1"
 kover = "0.7.6"
 grammarkit = "2022.3.2"