chore: finish Java 17 bump in libs and use Message.sendTo in PinCommand

Two small cleanups salvaged from the closed #36 that #40 didn't pick up:

- buildSrc/LibsConfig.kt: bump the libs module's source/target compatibility
  and TARGET_JVM_VERSION attribute from 1.8 to 17, matching the v8 Java 17
  baseline already applied to the rest of the project in #40.
- PinCommand.java: replace the two remaining
  sender.sendMessage(Message.get(...).toString()) calls with
  Message.get(...).sendTo(sender) so error messages render through the
  MiniMessage pipeline like the other pin messages instead of as the raw
  Component.toString() output.

Author: confuser

buildSrc/src/main/kotlin/LibsConfig.kt

@@ -35,8 +35,8 @@ fun Project.applyLibrariesConfiguration() {
     }
 
     plugins.withId("java") {
-        the<JavaPluginExtension>().setSourceCompatibility("1.8")
-        the<JavaPluginExtension>().setTargetCompatibility("1.8")
+        the<JavaPluginExtension>().setSourceCompatibility("17")
+        the<JavaPluginExtension>().setTargetCompatibility("17")
     }
 
     group = "${rootProject.group}.BanManagerWebEnhancerLibs"
@@ -89,7 +89,7 @@ fun Project.applyLibrariesConfiguration() {
             attribute(Category.CATEGORY_ATTRIBUTE, project.objects.named(Category.LIBRARY))
             attribute(Bundling.BUNDLING_ATTRIBUTE, project.objects.named(Bundling.SHADOWED))
             attribute(LibraryElements.LIBRARY_ELEMENTS_ATTRIBUTE, project.objects.named(LibraryElements.JAR))
-            attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 8)
+            attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 17)
         }
         outgoing.artifact(tasks.named("jar"))
     }
@@ -104,7 +104,7 @@ fun Project.applyLibrariesConfiguration() {
             attribute(Category.CATEGORY_ATTRIBUTE, project.objects.named(Category.LIBRARY))
             attribute(Bundling.BUNDLING_ATTRIBUTE, project.objects.named(Bundling.SHADOWED))
             attribute(LibraryElements.LIBRARY_ELEMENTS_ATTRIBUTE, project.objects.named(LibraryElements.JAR))
-            attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 8)
+            attribute(TargetJvmVersion.TARGET_JVM_VERSION_ATTRIBUTE, 17)
         }
         outgoing.artifact(tasks.named("jar"))
     }

common/src/main/java/me/confuser/banmanager/webenhancer/common/commands/PinCommand.java

@@ -42,15 +42,15 @@ public boolean onCommand(CommonSender sender, CommandParser parser) {
       try {
         player = getPlugin().getPlayerStorage().queryForId(sender.getData().getId());
       } catch (SQLException e) {
-        sender.sendMessage(Message.get("sender.error.exception").toString());
+        Message.get("sender.error.exception").sendTo(sender);
         e.printStackTrace();
         return;
       }
 
       PlayerPinData pin = plugin.getPlayerPinStorage().getValidPin(player);
 
       if (pin == null) {
-        sender.sendMessage(Message.get("sender.error.exception").toString());
+        Message.get("sender.error.exception").sendTo(sender);
         return;
       }