build: version jar filename

build.gradle.kts

@@ -24,6 +24,10 @@ tasks.withType<JavaCompile>().configureEach {
     options.encoding = "UTF-8"
 }
 
+tasks.jar {
+    archiveFileName.set("prometheus-spigot-${project.version}.jar")
+}
+
 tasks.processResources {
     filteringCharset = "UTF-8"
     filesMatching("plugin.yml") {