Merge branch 'ps/for-each-ref-in-fixes'

A handful of places used refs_for_each_ref_in() API incorrectly, which has been corrected. * ps/for-each-ref-in-fixes: bisect: simplify string_list memory handling bisect: fix misuse of `refs_for_each_ref_in()` pack-bitmap: fix bug with exact ref match in "pack.preferBitmapTips" pack-bitmap: deduplicate logic to iterate over preferred bitmap tips