What did you do before the bug happened? (Steps to reproduce your issue)

I have a git repository cloned which uses reftables.

git clone --ref-format=reftable https://github.com/eclipse-jgit/jgit.git

A jgit-program (java) is running and sleeping for 100seconds to 
demonstrate the problem.

         Git git = Git.init().setDirectory(new 
File("c:\\temp\\jgit")).call();

         FileRepository repo = (FileRepository) git.getRepository();

         try {
             Thread.sleep(100000);
         } catch (InterruptedException e) {
         }
         git.close();

While the jgit-program is sleeping in git-bash update a ref und pack the 
reftablefiles:

git update-ref refs/tags/test 939d321faccd12bff4cb13ce6358820297fbc78e

git pack-refs

What did you expect to happen? (Expected behavior)

git pack-refs should work without messages.

What happened instead? (Actual behavior)

git tries to unlink the reftable-files, but jgit hold windows-system 
lock, so the file can't be unlinked.
An answers 'n' for retry causes more asks. After the third try git give up.

Unlink of file 
'C:/temp/jgittest/jgit/.git/reftable/0x000000000002-0x000000000004-50486d0e.ref' 
failed. Should I try again? (y/n) n
Unlink of file 
'C:/temp/jgittest/jgit/.git/reftable/0x000000000002-0x000000000004-50486d0e.ref' 
failed. Should I try again? (y/n) n
Unlink of file 
'C:/temp/jgittest/jgit/.git/reftable/0x000000000002-0x000000000004-50486d0e.ref' 
failed. Should I try again? (y/n) n


What's different between what you expected and what actually happened?

I would expect, that git tries to unlink the files. But if this fails 
git should ignore this and try to delete the files next time on 
pack-files. Its documented in https://git-scm.com/docs/reftable

Anything else you want to add:

Please review the rest of the bug report below.
You can delete any lines you don't wish to share.


[System Info]
git version:
git version 2.48.0.rc2.windows.1
cpu: x86_64
built from commit: 049f0cf1a5d000f1e24f0e80b79b0d043a8b83b2
sizeof-long: 4
sizeof-size_t: 8
shell-path: D:/git-sdk-64-build-installers/usr/bin/sh
feature: fsmonitor--daemon
libcurl: 8.11.1
OpenSSL: OpenSSL 3.2.3 3 Sep 2024
zlib: 1.3.1
uname: Windows 10.0 22631
compiler info: gnuc: 14.2
libc info: no libc information available
$SHELL (typically, interactive shell): C:\Program Files\Git\usr\bin\bash.exe


[Enabled Hooks]
commit-msg