add patch fixing resume for snapshot and hibernate with drive with iothread and a dirty bitmap

Not difficult to run into, just have a drive with iothread, take a PBS
backup and then take a snapshot or hibernate. Resuming will fail with
> qemu: qemu_mutex_unlock_impl: Operation not permitted
because of not acquiring the correct AioContext first.

Migration is not affected, because it runs in coroutine context.

Reported in the community forum:
https://forum.proxmox.com/threads/129899/

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>

debian/patches/pve/0035-migration-block-dirty-bitmap-migrate-other-bitmaps-e.patch

@@ -19,7 +19,7 @@ Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
  1 file changed, 1 insertion(+), 1 deletion(-)
 
 diff --git a/migration/block-dirty-bitmap.c b/migration/block-dirty-bitmap.c
-index fe73aa94b1..a6440929fa 100644
+index 7eaf498439..509f3df0a6 100644
 --- a/migration/block-dirty-bitmap.c
 +++ b/migration/block-dirty-bitmap.c
 @@ -539,7 +539,7 @@ static int add_bitmaps_to_list(DBMSaveState *s, BlockDriverState *bs,