chore(deps): bump io.jenkins.plugins:gitlab-branch-source in /bom-weekly (#6082)

Bumps [io.jenkins.plugins:gitlab-branch-source](https://github.com/jenkinsci/gitlab-branch-source-plugin) from 736.v10e786eeea_19 to 739.v9781b_1cdb_72a_.
- [Release notes](https://github.com/jenkinsci/gitlab-branch-source-plugin/releases)
- [Commits](https://github.com/jenkinsci/gitlab-branch-source-plugin/commits)

---
updated-dependencies:
- dependency-name: io.jenkins.plugins:gitlab-branch-source
  dependency-version: 739.v9781b_1cdb_72a_
  dependency-type: direct:production
...

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Author: dependabot[bot]

bom-weekly/pom.xml

@@ -432,7 +432,7 @@
       <dependency>
         <groupId>io.jenkins.plugins</groupId>
         <artifactId>gitlab-branch-source</artifactId>
-        <version>736.v10e786eeea_19</version>
+        <version>739.v9781b_1cdb_72a_</version>
       </dependency>
       <dependency>
         <groupId>io.jenkins.plugins</groupId>