Bump org.apache.maven:maven-model from 3.9.1 to 3.9.6

Bumps [org.apache.maven:maven-model](https://github.com/apache/maven) from 3.9.1 to 3.9.6.
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](https://github.com/apache/maven/compare/maven-3.9.1...maven-3.9.6)

---
updated-dependencies:
- dependency-name: org.apache.maven:maven-model
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/buildtools/pom.xml b/buildtools/pom.xml
index 566d09d..2a06a64 100644
--- a/buildtools/pom.xml
+++ b/buildtools/pom.xml
@@ -56,7 +56,7 @@
         <dependency>
             <groupId>org.apache.maven</groupId>
             <artifactId>maven-model</artifactId>
-            <version>3.9.1</version>
+            <version>3.9.6</version>
             <optional>true</optional>
         </dependency>
         <dependency>