Upgrade project to Java 17 and Gradle 8

modules/build.gradle

@@ -11,21 +11,21 @@ subprojects {
     group 'com.bartlomiejpluta'
     version '1.0-SNAPSHOT'
 
-    sourceCompatibility = 1.8
+    sourceCompatibility = 17
 
     compileKotlin {
-        kotlinOptions.jvmTarget = "1.8"
+        kotlinOptions.jvmTarget = "17"
     }
     compileTestKotlin {
-        kotlinOptions.jvmTarget = "1.8"
+        kotlinOptions.jvmTarget = "17"
     }
 
     dependencies {
         // compileOnly important!!! We do not want to put the api into the zip file since the main program has it already!
-        compileOnly project(':api')
-        compile "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
+        implementation project(':api')
+        implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8"
         kapt(group: 'org.pf4j', name: 'pf4j', version: "3.2.0")
-        compileOnly(group: 'org.pf4j', name: 'pf4j', version: "3.2.0") {
+        implementation(group: 'org.pf4j', name: 'pf4j', version: "3.2.0") {
             exclude group: "org.slf4j"
         }
     }
@@ -46,7 +46,7 @@ subprojects {
             with jar
         }
         into('lib') {
-            from configurations.compile
+            from configurations.implementation
         }
         archiveExtension = 'zip'
     }