git: Update version to 2.34.1

git: Update version to 2.34.1

- Update from 2.33.1 to 2.34.1
- Update of rootfile - The "--preserve-merges" option of "git rebase" has been removed.
- Changelog is too large to include here.
   The changes for version 2.34.0 can be found in the source tarball in
   Documentation/RelNotes/2.34.0.txt and for version 2.34.1 in
   Documentation/RelNotes/2.34.1.txt

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>