Test git client plugin and git plugin pre-release builds

Git client plugin 6.1.1-rc3643.ff37e600016d includes JGit 7.1.0.
JGit 7.1.0 is scheduled to release 4 Dec 2024, so there is a small chance
that the version will be updated before the official release.

Git client plugin pull request for JGit 7.1.0 is:

* jenkinsci/git-client-plugin#1220

JGit 7.1.0 release notes are:

* https://projects.eclipse.org/projects/technology.jgit/releases/7.1.0

Git plugin 5.6.1-rc5357.7a_4955e76288 adds credentials to the GitClient
object before decorating the object with settings from extensions.
A plugin that adds a deocrator will now be able to adjust the credentials
if needed.

* jenkinsci/git-plugin#1687
* https://issues.jenkins.io/browse/JENKINS-73677

Tested by running:

PLUGINS=github-branch-source,cloudbees-bitbucket-branch-source,,mailer TEST=InjectedTest bash local-test.sh

bom-weekly/pom.xml

@@ -20,7 +20,7 @@
     <declarative-pipeline-migration-assistant-plugin.version>1.6.4</declarative-pipeline-migration-assistant-plugin.version>
     <forensics-api.version>2.6.0</forensics-api.version>
     <github-api-plugin.version>1.321-478.vc9ce627ce001</github-api-plugin.version>
-    <git-plugin.version>5.6.0</git-plugin.version>
+    <git-plugin.version>5.6.1-rc5357.7a_4955e76288</git-plugin.version>
     <junit-plugin.version>1309.v0078b_fecd6ed</junit-plugin.version>
     <mina-sshd-api.version>2.14.0-133.vcc091215a_358</mina-sshd-api.version>
     <okhttp-api-plugin.version>4.11.0-181.v1de5b_83857df</okhttp-api-plugin.version>
@@ -962,7 +962,7 @@
       <dependency>
         <groupId>org.jenkins-ci.plugins</groupId>
         <artifactId>git-client</artifactId>
-        <version>6.1.0</version>
+        <version>6.1.1-rc3643.ff37e600016d</version>
       </dependency>
       <dependency>
         <groupId>org.jenkins-ci.plugins</groupId>