fix(CVE-2023-35116,CVE-2025-52999): upgrade jackson to 2.16.2 (Related to #15025)

[zmz789]

What is the purpose of the change

升级 nacos v2.x 中依赖的 Jackson 版本至 2.16.2，修复：

• CVE-2023-35116 — jackson-databind 反序列化栈溢出漏洞
• CVE-2025-52999 — jackson-core 资源耗尽漏洞

Brief changelog

1. 新增 <jackson.version>2.16.2</jackson.version>
2. 在 中显式 import jackson-bom

Verifying this change

BOM 覆盖范围验证：jackson-databind、jackson-core 已覆盖
升级后实际依赖版本，均为 2.16.2：
$ mvn dependency:tree -pl distribution -am -Dincludes='com.fasterxml.jackson*'
[INFO] +- com.fasterxml.jackson.core:jackson-core:jar:2.16.2:compile
[INFO] +- com.fasterxml.jackson.core:jackson-databind:jar:2.16.2:compile
[INFO] +- com.fasterxml.jackson.core:jackson-annotations:jar:2.16.2:compile
[INFO] +- com.fasterxml.jackson.datatype:jackson-datatype-jdk8:jar:2.16.2:compile
[INFO] +- com.fasterxml.jackson.datatype:jackson-datatype-jsr310:jar:2.16.2:compile
[INFO] +- com.fasterxml.jackson.module:jackson-module-parameter-names:jar:2.16.2:compile

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[github-actions]

Thanks for your this PR. 🙏
Please check again for your PR changes whether contains any usage/api/configuration change such as Add new API , Add new configuration, Change default value of configuration.
If so, please add or update documents(markdown type) in docs/next/ for repository nacos-group/nacos-group.github.io

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感谢您提交的PR。 🙏
请再次查看您的PR内容，确认是否包含任何使用方式/API/配置参数的变更，如：新增API、新增配置参数、修改默认配置等操作。
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