Add Jackson 2 Databind as Optional Dependency

Since spring-security-webauthn has Jackson 2 Mixins, it would
be clearer to set Jackson 2 explicitly as an optional dependency

Author: jzheaux

webauthn/spring-security-webauthn.gradle

@@ -18,6 +18,7 @@ dependencies {
 	optional 'org.springframework:spring-jdbc'
 	optional 'org.springframework:spring-tx'
 	optional 'tools.jackson.core:jackson-databind'
+	optional 'com.fasterxml.jackson.core:jackson-databind'
 
 	provided 'jakarta.servlet:jakarta.servlet-api'