fix: distribution/examples/soap/add-soap-header/pom.xml to reduce vul…

…nerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-COMGOOGLEGUAVA-5710356
- https://snyk.io/vuln/SNYK-JAVA-ORGBITBUCKETBC-5488281
- https://snyk.io/vuln/SNYK-JAVA-ORGBITBUCKETBC-6036303
- https://snyk.io/vuln/SNYK-JAVA-ORGBITBUCKETBC-6139942
- https://snyk.io/vuln/SNYK-JAVA-ORGBOUNCYCASTLE-5771340
- https://snyk.io/vuln/SNYK-JAVA-ORGBOUNCYCASTLE-6084023
- https://snyk.io/vuln/SNYK-JAVA-ORGJSON-5488379
- https://snyk.io/vuln/SNYK-JAVA-ORGJSON-5962464
- https://snyk.io/vuln/SNYK-JAVA-ORGSPRINGFRAMEWORK-5422217
- https://snyk.io/vuln/SNYK-JAVA-ORGSPRINGFRAMEWORK-6261586
- https://snyk.io/vuln/SNYK-JAVA-ORGYAML-3152153

distribution/examples/soap/add-soap-header/pom.xml

@@ -21,7 +21,7 @@
         <dependency>
             <groupId>org.membrane-soa</groupId>
             <artifactId>service-proxy-core</artifactId>
-            <version>4.9.1</version>
+            <version>5.3.4</version>
         </dependency>
 
     </dependencies>