Bump the java-production-dependencies group with 1 update

---
updated-dependencies:
- dependency-name: org.apache.jackrabbit:jackrabbit-webdav
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: java-production-dependencies
...

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

pom.xml

@@ -19,7 +19,7 @@
 
  <!-- dependencies -->
  <servlet.version>4.0.1</servlet.version>
- <jackrabbit.version>2.21.20</jackrabbit.version>
+ <jackrabbit.version>2.21.21</jackrabbit.version>
  <guava.version>32.1.3-jre</guava.version>
  <slf4j.version>2.0.9</slf4j.version>