fix git bisect with annotaged tags
    
    As git bisect was migrated from shell to C, the bisect_state conversion
    lost the ability to handle annotated tags.  This was not intentional.
    
    It is fixed in upstream commit 7730f85594 (bisect: peel annotated tags
    to commits, 2021-03-16).
    
    References:
    https://lore.kernel.org/git/878s6nz1sg.fsf@igel.home/
    https://github.com/git/git/commit/7730f85594.patch