fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-ORGSPRINGFRAMEWORK-7945490

Author: snyk-bot

pom.xml

@@ -47,7 +47,7 @@
 		<dependency>
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-webmvc</artifactId>
-			<version>4.2.6.RELEASE</version>
+			<version>6.1.13</version>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework</groupId>