fix: samples/client/petstore/java/webclient/pom.xml to reduce vulnera…

…bilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-IOPROJECTREACTORNETTY-6057720
- https://snyk.io/vuln/SNYK-JAVA-ORGYAML-3152153

samples/client/petstore/java/webclient/pom.xml

@@ -126,7 +126,7 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <swagger-annotations-version>1.6.2</swagger-annotations-version>
-        <spring-web-version>2.4.3</spring-web-version>
+        <spring-web-version>3.1.6</spring-web-version>
         <jackson-version>2.11.3</jackson-version>
         <jackson-databind-version>2.11.3</jackson-databind-version>
         <jackson-databind-nullable-version>0.2.1</jackson-databind-nullable-version>