Bump gitlab-branch-source in /bom-weekly (#1609)

Bumps [gitlab-branch-source](https://github.com/jenkinsci/gitlab-branch-source-plugin) from 642.v9ed86b_b_54384 to 643.vdc12a_4a_06434.
- [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-type: direct:production
...

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

bom-2.361.x/pom.xml

@@ -17,6 +17,11 @@
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>
+            <dependency>
+                <groupId>io.jenkins.plugins</groupId>
+                <artifactId>gitlab-branch-source</artifactId>
+                <version>642.v9ed86b_b_54384</version>
+            </dependency>
             <dependency>
                 <groupId>org.jenkins-ci.plugins</groupId>
                 <artifactId>cloudbees-folder</artifactId>

bom-weekly/pom.xml

@@ -136,7 +136,7 @@
             <dependency>
                 <groupId>io.jenkins.plugins</groupId>
                 <artifactId>gitlab-branch-source</artifactId>
-                <version>642.v9ed86b_b_54384</version>
+                <version>643.vdc12a_4a_06434</version>
             </dependency>
             <dependency>
                 <groupId>io.jenkins.plugins</groupId>