Bump mavenMinimalVersion from 3.8.3 to 3.9.9

Bumps `mavenMinimalVersion` from 3.8.3 to 3.9.9.

Updates `org.apache.maven:maven-core` from 3.8.3 to 3.9.9
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.8.3...maven-3.9.9)

Updates `org.apache.maven:maven-compat` from 3.8.3 to 3.9.9
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.8.3...maven-3.9.9)

Updates `org.apache.maven:maven-repository-metadata` from 3.8.3 to 3.9.9
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.8.3...maven-3.9.9)

Updates `org.apache.maven:maven-resolver-provider` from 3.8.3 to 3.9.9
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.8.3...maven-3.9.9)

Updates `org.apache.maven:maven-embedder` from 3.8.3 to 3.9.9
- [Release notes](https://github.com/apache/maven/releases)
- [Commits](apache/maven@maven-3.8.3...maven-3.9.9)

---
updated-dependencies:
- dependency-name: org.apache.maven:maven-core
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.maven:maven-compat
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.maven:maven-repository-metadata
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.maven:maven-resolver-provider
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.apache.maven:maven-embedder
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pom.xml

@@ -53,7 +53,7 @@ THE SOFTWARE.
       It declares version of the core, which should be included into the the server-side.
       Note that the plugin still bundles agent support for Maven 3.0.5, probably it's not really operational
     -->
-    <mavenMinimalVersion>3.8.3</mavenMinimalVersion>
+    <mavenMinimalVersion>3.9.9</mavenMinimalVersion>
     <resolverVersion>1.7.3</resolverVersion>
     <sisuInjectVersion>0.3.5</sisuInjectVersion>
     <wagonVersion>3.5.3</wagonVersion>