Upgrade Nimbus JOSE + JWT to 5.6

Fixes: gh-5089

gradle/dependency-management.gradle

@@ -42,7 +42,7 @@ dependencyManagement {
 		dependency 'com.google.guava:guava:20.0'
 		dependency 'com.google.inject:guice:3.0'
 		dependency 'com.nimbusds:lang-tag:1.4.3'
-		dependency 'com.nimbusds:nimbus-jose-jwt:5.5'
+		dependency 'com.nimbusds:nimbus-jose-jwt:5.6'
 		dependency 'com.nimbusds:oauth2-oidc-sdk:5.56'
 		dependency 'com.squareup.okhttp3:okhttp:3.9.0'
 		dependency 'com.squareup.okio:okio:1.13.0'