Bump org.apache.maven:apache-maven from 3.6.3 to 3.9.9

Bumps [org.apache.maven:apache-maven](https://github.com/apache/maven) from 3.6.3 to 3.9.9.
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.6.3...maven-3.9.9)

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

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

takari-plugin-testing-its/pom.xml

@@ -123,21 +123,21 @@
                 <artifactItem>
                   <groupId>org.apache.maven</groupId>
                   <artifactId>apache-maven</artifactId>
-                  <version>3.6.3</version>
+                  <version>3.9.9</version>
                   <classifier>bin</classifier>
                   <type>tar.gz</type>
                 </artifactItem>
                 <artifactItem>
                   <groupId>org.apache.maven</groupId>
                   <artifactId>apache-maven</artifactId>
-                  <version>3.8.8</version>
+                  <version>3.9.9</version>
                   <classifier>bin</classifier>
                   <type>tar.gz</type>
                 </artifactItem>
                 <artifactItem>
                   <groupId>org.apache.maven</groupId>
                   <artifactId>apache-maven</artifactId>
-                  <version>3.9.8</version>
+                  <version>3.9.9</version>
                   <classifier>bin</classifier>
                   <type>tar.gz</type>
                 </artifactItem>