Use a separate thread for every custom update checker

src/main/java/com/terraformersmc/modmenu/api/UpdateChecker.java

@@ -2,6 +2,12 @@
 
 public interface UpdateChecker {
 
+	/**
+	 * Gets called when ModMenu is checking for updates.
+	 * This is done in a separate thread, so this call can/should be blocking.
+	 *
+	 * @return The update info
+	 */
 	UpdateInfo checkForUpdates();
 
 }

src/main/java/com/terraformersmc/modmenu/util/UpdateCheckerThread.java

@@ -0,0 +1,17 @@
+package com.terraformersmc.modmenu.util;
+
+import com.terraformersmc.modmenu.util.mod.Mod;
+
+public class UpdateCheckerThread extends Thread {
+
+	protected UpdateCheckerThread(Mod mod, Runnable runnable) {
+		super(runnable);
+		setDaemon(true);
+		setName("Update Checker/%s".formatted(mod.getName()));
+	}
+
+	public static void run(Mod mod, Runnable runnable) {
+		new UpdateCheckerThread(mod, runnable).start();
+	}
+
+}

src/main/java/com/terraformersmc/modmenu/util/UpdateCheckerUtil.java

@@ -39,11 +39,9 @@ public static void checkForUpdates() {
 			return;
 		}
 
-		Util.getMainWorkerExecutor().execute(() -> {
-			LOGGER.info("Checking mod updates...");
-			checkForModrinthUpdates();
-			checkForCustomUpdates();
-		});
+		LOGGER.info("Checking mod updates...");
+		Util.getMainWorkerExecutor().execute(UpdateCheckerUtil::checkForModrinthUpdates);
+		checkForCustomUpdates();
 	}
 
 	public static void checkForCustomUpdates() {
@@ -52,7 +50,7 @@ public static void checkForCustomUpdates() {
 			if (updateChecker == null) {
 				return;
 			}
-			mod.setUpdateInfo(updateChecker.checkForUpdates());
+			UpdateCheckerThread.run(mod, () -> mod.setUpdateInfo(updateChecker.checkForUpdates()));
 		});
 	}