chore(deps): bump org.jenkins-ci.plugins:email-ext in /bom-weekly (#4289

)

Bumps [org.jenkins-ci.plugins:email-ext](https://github.com/jenkinsci/email-ext-plugin) from 1866.v14fa_6d201654 to 1876.v28d8d38315b_d.
- [Release notes](https://github.com/jenkinsci/email-ext-plugin/releases)
- [Changelog](https://github.com/jenkinsci/email-ext-plugin/blob/main/CHANGELOG.adoc)
- [Commits](https://github.com/jenkinsci/email-ext-plugin/commits)

---
updated-dependencies:
- dependency-name: org.jenkins-ci.plugins:email-ext
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

bom-weekly/pom.xml

@@ -986,7 +986,7 @@
       <dependency>
         <groupId>org.jenkins-ci.plugins</groupId>
         <artifactId>email-ext</artifactId>
-        <version>1866.v14fa_6d201654</version>
+        <version>1876.v28d8d38315b_d</version>
       </dependency>
       <dependency>
         <groupId>org.jenkins-ci.plugins</groupId>