Bump org.apache.struts:struts2-core from 2.1.8.1 to 6.7.0

Bumps [org.apache.struts:struts2-core](https://github.com/apache/struts) from 2.1.8.1 to 6.7.0.
- [Release notes](https://github.com/apache/struts/releases)
- [Commits](https://github.com/apache/struts/commits)

---
updated-dependencies:
- dependency-name: org.apache.struts:struts2-core
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

examples/struts/pom.xml

@@ -94,7 +94,7 @@
     <dependency>
       <groupId>org.apache.struts</groupId>
       <artifactId>struts2-core</artifactId>
-      <version>2.1.8.1</version>
+      <version>6.7.0</version>
     </dependency>
     <dependency>
       <groupId>org.apache.struts</groupId>