add optional spring-security-rsa

spring-cloud-netflix-sidecar/pom.xml

@@ -45,6 +45,11 @@
 			<groupId>org.springframework.cloud</groupId>
 			<artifactId>spring-cloud-netflix-core</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework.security</groupId>
+			<artifactId>spring-security-rsa</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>com.netflix.eureka</groupId>
 			<artifactId>eureka-client</artifactId>