Bump spring-web from 4.0.9.RELEASE to 6.0.0

Bumps [spring-web](https://github.com/spring-projects/spring-framework) from 4.0.9.RELEASE to 6.0.0.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](https://github.com/spring-projects/spring-framework/compare/v4.0.9.RELEASE...v6.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index 5fb1c2c..4908b29 100644
--- a/pom.xml
+++ b/pom.xml
@@ -45,7 +45,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <!-- allowed values: R7, 1.0, 1.5, 2.0 or none -->
         <wtp.version>none</wtp.version>
-        <spring.version>4.0.9.RELEASE</spring.version>
+        <spring.version>6.0.0</spring.version>
         <wicket-bootstrap.version>0.9.2</wicket-bootstrap.version>
         <jersey.version>1.19.4</jersey.version>
     </properties>