Align all Jackson artifacts to version 2.18.6

[Copilot]

Mixing jackson-core 2.18.x with jackson-databind and jackson-annotations 2.14.x in dependencyManagement risks runtime incompatibilities and dependency convergence issues. All three artifacts must stay on the same version line.

Changes

• jackson-databind: 2.14.0 → 2.18.6
• jackson-annotations: 2.14.0 → 2.18.6
• jackson-core: already at 2.18.6 (unchanged)

<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.18.6</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-core</artifactId>
    <version>2.18.6</version>
</dependency>
<dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-annotations</artifactId>
    <version>2.18.6</version>
</dependency>

---

🔒 GitHub Advanced Security automatically protects Copilot coding agent pull requests. You can protect all pull requests by enabling Advanced Security for your repositories. Learn more about Advanced Security.