Cargo.lock: drop the stale blake3 entry under ndarray

`ndarray` removed `blake3` as a dependency deliberately -- its Cargo.toml now
carries "blake3 -- NO LONGER A DEPENDENCY. Do not re-add it.", with BLAKE3 moved
in-tree to `src/hpc/blake3.rs` to break a `ndarray -> blake3 -> ndarray` cycle
and to shed blake3's unconditional `cc` build-dependency. lance-graph's lockfile
never caught up and still listed it.

Cargo corrected it on its own during the supervisor test runs for the
cycle-driver CI step; this commit just records that correction rather than
leaving the tree dirty.

Verified this reflects ndarray's DEFAULT branch (master @ 417f66a3), not the
in-flight ndarray branch this session is also pushing -- a lock refresh that
pinned lance-graph to an unmerged sibling state would be the wrong thing to
commit, so that was checked before landing it.

Author: claude