build: set ver 0.1.7; attempt fix publishing errors

gradle.properties

@@ -18,7 +18,7 @@
 #
 
 # Main
-version=0.1.6
+version=0.1.7
 description=User playtime monitoring for MC
 
 # Misc

playtimestats-plugin-core/build.gradle.kts

@@ -36,6 +36,19 @@ dependencies {
     testImplementation(kotlin("test"))
 }
 
+publishing {
+    publications {
+        withType<MavenPublication>().configureEach {
+            if (name == "gpr") {
+                artifacts.clear()
+                artifact(tasks.named("shadowJar").get()) {
+                    classifier = "all"
+                }
+            }
+        }
+    }
+}
+
 tasks {
     jar {
         enabled = true
@@ -48,6 +61,13 @@ tasks {
         }
     }
 
+    compileTestKotlin {
+        compilerOptions {
+            jvmTarget = JvmTarget.JVM_21
+            apiVersion = KotlinVersion.KOTLIN_2_1
+        }
+    }
+
     compileJava {
         options.isDeprecation = true
         options.encoding = "UTF-8"
@@ -61,9 +81,4 @@ tasks {
 java {
     sourceCompatibility = JavaVersion.VERSION_21
     targetCompatibility = JavaVersion.VERSION_21
-    toolchain.languageVersion.set(JavaLanguageVersion.of(21))
 }
-
-kotlin {
-    jvmToolchain(21)
-}