Bump org.springframework:spring-webmvc in /geowebcache

Bumps [org.springframework:spring-webmvc](https://github.com/spring-projects/spring-framework) from 5.3.39 to 6.1.14.
- [Release notes](https://github.com/spring-projects/spring-framework/releases)
- [Commits](spring-projects/spring-framework@v5.3.39...v6.1.14)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

geowebcache/pom.xml

@@ -54,7 +54,7 @@
     <gt.version>33-SNAPSHOT</gt.version>
     <jts.version>1.20.0</jts.version>
     <jaiext.version>1.1.27</jaiext.version>
-    <spring.version>5.3.39</spring.version>
+    <spring.version>6.1.14</spring.version>
     <spring.security.version>5.7.13</spring.security.version>
     <xstream.version>1.4.21</xstream.version>
     <commons-io.version>2.16.1</commons-io.version>