Add serialVersionUID

This commit gives a serialVersionUID to the private adapter class for the Jwt
authentication principal. It also adds a SuppressWarnings annotation so that
it doesn't get picked up by config's serialization tests. This is needed since
the test cannot construct a serialization sample for a private class

Issue gh-6237

Signed-off-by: Josh Cummings <3627351+jzheaux@users.noreply.github.com>

Author: jzheaux

oauth2/oauth2-resource-server/src/main/java/org/springframework/security/oauth2/server/resource/authentication/JwtAuthenticationConverter.java

@@ -16,6 +16,7 @@
 
 package org.springframework.security.oauth2.server.resource.authentication;
 
+import java.io.Serial;
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.List;
@@ -89,8 +90,12 @@ public void setPrincipalClaimName(String principalClaimName) {
 		this.jwtPrincipalConverter = (jwt) -> new JwtAuthenticatedPrincipal(jwt, principalClaimName);
 	}
 
+	@SuppressWarnings("serial") // suppress warnings in serialization tests
 	private static final class JwtAuthenticatedPrincipal extends Jwt implements OAuth2AuthenticatedPrincipal {
 
+		@Serial
+		private static final long serialVersionUID = 2236855178032591277L;
+
 		private final String principalClaimName;
 
 		JwtAuthenticatedPrincipal(Jwt jwt) {