fix: samples/client/petstore/java/microprofile-rest-client-outer-enum/pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHECXF-10755067

Author: snyk-bot

samples/client/petstore/java/microprofile-rest-client-outer-enum/pom.xml

@@ -167,7 +167,7 @@
     <microprofile.rest.client.api.version>2.0</microprofile.rest.client.api.version>
     <smallrye.rest.client.version>1.2.1</smallrye.rest.client.version>
     <smallrye.config.version>1.3.5</smallrye.config.version>
-    <cxf.rt.rs.extension.providers.version>3.2.6</cxf.rt.rs.extension.providers.version>
+    <cxf.rt.rs.extension.providers.version>3.5.11</cxf.rt.rs.extension.providers.version>
     <jaxb.core.version>2.2.11</jaxb.core.version>
     <jaxb.impl.version>2.2.11</jaxb.impl.version>
     <hibernate.validator.version>5.2.2.Final</hibernate.validator.version>