Remove spurious final class modifiers

These are already implied by the `@Value` Lombok annotation - the explicit
modifier probably appeared when we used delombok to generate the new
constructors. (Most) other classes in the repo don't have the explicit `final`
modifier, so let's leave it out here too so it doesn't seem like these classes
are different.

Author: emlun

webauthn-server-core/src/main/java/com/yubico/webauthn/StartAssertionOptions.java

@@ -40,7 +40,7 @@
 /** Parameters for {@link RelyingParty#startAssertion(StartAssertionOptions)}. */
 @Value
 @Builder(toBuilder = true)
-public final class StartAssertionOptions {
+public class StartAssertionOptions {
 
   private final String username;
 

webauthn-server-core/src/main/java/com/yubico/webauthn/StartRegistrationOptions.java

@@ -40,7 +40,7 @@
 /** Parameters for {@link RelyingParty#startRegistration(StartRegistrationOptions)}. */
 @Value
 @Builder(toBuilder = true)
-public final class StartRegistrationOptions {
+public class StartRegistrationOptions {
 
   /** Identifiers for the user creating a credential. */
   @NonNull private final UserIdentity user;