Bump org.jenkins-ci.plugins:build-blocker-plugin from 1.7.8 to 1.7.9

Bumps [org.jenkins-ci.plugins:build-blocker-plugin](https://github.com/jenkinsci/build-blocker-plugin) from 1.7.8 to 1.7.9.
- [Release notes](https://github.com/jenkinsci/build-blocker-plugin/releases)
- [Changelog](https://github.com/jenkinsci/build-blocker-plugin/blob/master/CHANGELOG.md)
- [Commits](jenkinsci/build-blocker-plugin@build-blocker-plugin-1.7.8...build-blocker-plugin-1.7.9)

---
updated-dependencies:
- dependency-name: org.jenkins-ci.plugins:build-blocker-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

declarative-pipeline-migration-assistant/pom.xml

@@ -40,7 +40,7 @@
     <dependency>
       <groupId>org.jenkins-ci.plugins</groupId>
       <artifactId>build-blocker-plugin</artifactId>
-      <version>1.7.8</version>
+      <version>1.7.9</version>
       <optional>true</optional>
     </dependency>
     <dependency>