[Tutorials] Bump maven version to 3.9.15

[github-actions]

Bump the Maven docker images versions for various tutorials

[maven-agent] Bump maven version in dockerfiles/maven/Dockerfile

changed lines [8] of file "dockerfiles/maven/Dockerfile"

maven-3.9.15

<!-- Optional: add a release summary here -->
## 📝 Documentation updates

- Use new Maven logos in documentation ([#11938](https://github.com/apache/maven/pull/11938)) @slawekjaranowski
- document modelVersion only supported value: 4.0.0 ([#11809](https://github.com/apache/maven/pull/11809)) @hboutemy

## 📦 Dependency updates

- Bump actions/upload-artifact from 7.0.0 to 7.0.1 ([#11932](https://github.com/apache/maven/pull/11932)) @[dependabot[bot]](https://github.com/apps/dependabot)
- Bump org.codehaus.plexus:plexus-utils from 3.6.0 to 3.6.1 ([#11876](https://github.com/apache/maven/pull/11876)) @[dependabot[bot]](https://github.com/apps/dependabot)
- Bump org.fusesource.jansi:jansi from 2.4.2 to 2.4.3 ([#11865](https://github.com/apache/maven/pull/11865)) @[dependabot[bot]](https://github.com/apps/dependabot)
- Bump actions/cache from 5.0.3 to 5.0.4 ([#11813](https://github.com/apache/maven/pull/11813)) @[dependabot[bot]](https://github.com/apps/dependabot)
- Bump actions/download-artifact from 8.0.0 to 8.0.1 ([#11790](https://github.com/apache/maven/pull/11790)) @[dependabot[bot]](https://github.com/apps/dependabot)

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