odb: drop gaps in object info flag values
The object info flag values have a two gaps in their definitions, where some bits are skipped over. These gaps don't really hurt, but it makes one wonder whether anything is going on and whether a subset of flags might be defined somewhere else. That's not the case though. Instead, this is a case of flags that have been dropped in the past: - The value 4 was used by `OBJECT_INFO_SKIP_CACHED`, removed in 9c8a294a1a (sha1-file: remove OBJECT_INFO_SKIP_CACHED, 2020-01-02). - The value 8 was used by `OBJECT_INFO_ALLOW_UNKNOWN_TYPE`, removed in ae24b032a0 (object-file: drop OBJECT_INFO_ALLOW_UNKNOWN_TYPE flag, 2025-05-16). Close those gaps to avoid any more confusion. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>