chore(deps): update dependency javax.servlet:javax.servlet-api to v4

Author: renovate[bot]

pom.xml

@@ -41,7 +41,7 @@
         <hsqldb.version>2.7.0</hsqldb.version>
         <persistence-api.version>2.2</persistence-api.version>
         <resource-server.version>1.3.1</resource-server.version>
-        <servlet-api.version>3.1.0</servlet-api.version>
+        <servlet-api.version>4.0.1</servlet-api.version>
         <slf4j.version>2.0.6</slf4j.version>
         <spring.version>4.3.30.RELEASE</spring.version>