build(deps): bump org.apache.dubbo:dubbo-bom from 3.2.6 to 3.2.8

Bumps [org.apache.dubbo:dubbo-bom](https://github.com/apache/dubbo) from 3.2.6 to 3.2.8.
- [Release notes](https://github.com/apache/dubbo/releases)
- [Changelog](https://github.com/apache/dubbo/blob/3.2/CHANGES.md)
- [Commits](apache/dubbo@dubbo-3.2.6...dubbo-3.2.8)

---
updated-dependencies:
- dependency-name: org.apache.dubbo:dubbo-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

bubble-dependencies/pom.xml

@@ -46,7 +46,7 @@
  <mica.version>3.1.3</mica.version>
  <mica-auto.version>2.3.2</mica-auto.version>
  <easy-trans.version>2.2.6</easy-trans.version>
- <dubbo.version>3.2.7</dubbo.version>
+ <dubbo.version>3.2.8</dubbo.version>
  <sms4j.version>3.0.1</sms4j.version>
  </properties>