Update to version catalogs

build.gradle.kts

@@ -1,10 +1,7 @@
-val kotlinVersion by extra { "2.1.20" }
-val junitVersion by extra { "5.8.1" }
-
 plugins {
-    kotlin("jvm") version "2.1.20"
-    id("org.jetbrains.dokka") version "1.9.20"
-    id("io.github.gradle-nexus.publish-plugin") version "2.0.0"
+    alias(libs.plugins.kotlin.jvm)
+    alias(libs.plugins.dokka)
+    alias(libs.plugins.nexus.publish)
     `java-library`
     `maven-publish`
     signing
@@ -18,9 +15,9 @@ repositories {
 }
 
 dependencies {
-    implementation("org.jetbrains.kotlin:kotlin-stdlib:$kotlinVersion")
-    testImplementation("org.junit.jupiter:junit-jupiter-api:$junitVersion")
-    testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:$junitVersion")
+    implementation(libs.kotlin.stdlib)
+    testImplementation(libs.junit.api)
+    testRuntimeOnly(libs.junit.engine)
 }
 
 tasks.getByName<Test>("test") {

gradle/libs.versions.toml

@@ -0,0 +1,15 @@
+[versions]
+kotlin = "2.1.20"
+junit = "5.8.1"
+dokka = "1.9.20"
+nexus = "2.0.0"
+
+[plugins]
+kotlin-jvm = { id = "org.jetbrains.kotlin.jvm", version.ref = "kotlin" }
+dokka = { id = "org.jetbrains.dokka", version.ref = "dokka" }
+nexus-publish = { id = "io.github.gradle-nexus.publish-plugin", version.ref = "nexus" }
+
+[libraries]
+kotlin-stdlib = { module = "org.jetbrains.kotlin:kotlin-stdlib", version.ref = "kotlin" }
+junit-api = { module = "org.junit.jupiter:junit-jupiter-api", version.ref = "junit" }
+junit-engine = { module = "org.junit.jupiter:junit-jupiter-engine", version.ref = "junit" }

settings.gradle

@@ -1,2 +1 @@
 rootProject.name = 'javatimefun'
-