ci: download JGit from maven, not eclipse.org

As Matthias Sohn, JGit maintainer, recommends, update the JGit
download link from repo.eclipse.org to a one in maven.org

Helped-by: Johannes Schindelin <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: gitster

ci/install-dependencies.sh

@@ -9,7 +9,7 @@ begin_group "Install dependencies"
 
 P4WHENCE=https://cdist2.perforce.com/perforce/r23.2
 LFSWHENCE=https://github.com/github/git-lfs/releases/download/v$LINUX_GIT_LFS_VERSION
-JGITWHENCE=https://repo.eclipse.org/content/groups/releases//org/eclipse/jgit/org.eclipse.jgit.pgm/6.8.0.202311291450-r/org.eclipse.jgit.pgm-6.8.0.202311291450-r.sh
+JGITWHENCE=https://repo1.maven.org/maven2/org/eclipse/jgit/org.eclipse.jgit.pgm/6.8.0.202311291450-r/org.eclipse.jgit.pgm-6.8.0.202311291450-r.sh
 
 # Make sudo a no-op and execute the command directly when running as root.
 # While using sudo would be fine on most platforms when we are root already,