reduce api surface

src/main/java/org/cryptomator/common/settings/Settings.java

@@ -161,7 +161,7 @@ public class Settings {
 		}
 	}
 
-	public SettingsJson serialized() {
+	SettingsJson serialized() {
 		var json = new SettingsJson();
 		json.directories = directories.stream().map(VaultSettings::serialized).toList();
 		json.askedForUpdateCheck = askedForUpdateCheck.get();

src/main/java/org/cryptomator/common/settings/VaultSettings.java

@@ -109,7 +109,7 @@ public class VaultSettings {
 		return BaseEncoding.base64Url().encode(randomBytes);
 	}
 
-	public VaultSettingsJson serialized() {
+	VaultSettingsJson serialized() {
 		var json = new VaultSettingsJson();
 		json.id = id;
 		json.path = path.map(Path::toString).getValue();