Switch HOCON dependency from typesafe-config to Jig

Jig (ma.chinespirit::jig) is the SummerCMS standard for HOCON.
Uses sconfig under the hood (no Java deps, Scala Native
compatible). Adapts HoconLoader to sconfig's parameterless method style.

build.sbt

@@ -6,7 +6,7 @@ lazy val root = (project in file("."))
     scalaVersion := "3.3.4",
 
     libraryDependencies ++= Seq(
-      "com.typesafe" % "config"  % "1.4.3",
+      "ma.chinespirit" %% "jig" % "0.1.0",
       "org.scalameta" %% "munit" % "1.0.3" % Test,
     ),
 

src/main/scala/summer/phrasebook/HoconLoader.scala

@@ -1,6 +1,7 @@
 package summer.phrasebook
 
-import com.typesafe.config.{Config, ConfigFactory, ConfigValueType}
+import machinespir.it.jig.{Config, ConfigFactory}
+import org.ekrich.config.ConfigValueType
 import java.nio.file.{Files, Path}
 import scala.jdk.CollectionConverters.*
 
@@ -39,10 +40,10 @@ object HoconLoader:
   /** Flatten a Typesafe Config into a string map. */
   def flatten(config: Config): Map[String, String] =
     val builder = Map.newBuilder[String, String]
-    for entry <- config.entrySet().asScala do
+    for entry <- config.entrySet.asScala do
       val key   = entry.getKey.nn
       val value = entry.getValue.nn
-      value.valueType() match
+      value.valueType match
         case ConfigValueType.STRING | ConfigValueType.NUMBER | ConfigValueType.BOOLEAN =>
           builder += key -> config.getString(key).nn
         case ConfigValueType.NULL =>