Bump org.springframework.version from 5.1.13.RELEASE to 5.3.31-wso2v1

Bumps `org.springframework.version` from 5.1.13.RELEASE to 5.3.31-wso2v1.

Updates `org.springframework:spring-core` from 5.1.13.RELEASE to 5.3.31-wso2v1
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/commits)

Updates `org.springframework:spring-context` from 5.1.13.RELEASE to 5.3.31-wso2v1
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/commits)

Updates `org.springframework:spring-web` from 5.1.13.RELEASE to 5.3.31-wso2v1
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/commits)

Updates `org.springframework:spring-webmvc` from 5.1.13.RELEASE to 5.3.31-wso2v1
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/commits)

---
updated-dependencies:
- dependency-name: org.springframework:spring-core
  dependency-type: direct:production
- dependency-name: org.springframework:spring-context
  dependency-type: direct:production
- dependency-name: org.springframework:spring-web
  dependency-type: direct:production
- dependency-name: org.springframework:spring-webmvc
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -1392,7 +1392,7 @@
         <testng.version>6.11</testng.version>
         <org.apache.cxf.version>3.5.5</org.apache.cxf.version>
         <org.apache.axis2.transport.version>2.0.0-wso2v66</org.apache.axis2.transport.version> <!-- not used -->
-        <org.springframework.version>5.1.13.RELEASE</org.springframework.version>
+        <org.springframework.version>5.3.31-wso2v1</org.springframework.version>
         <org.apache.tomcat>7.0.96</org.apache.tomcat>
         <org.codehaus.jackson.version>1.9.13</org.codehaus.jackson.version>
         <carbon.rest.api.version>4.2.2</carbon.rest.api.version>