build(deps): kv-lance lance 6.0.0 → =7.0.0, lancedb 0.29.0 → =0.30.0

surrealdb-core's `kv-lance` feature pinned lance/lance-index `=6.0.0` +
lancedb `=0.29.0`, which require object_store ^0.12.3 — contradicting this
workspace's own `object_store = "0.13.0"` (lance 6 needs object_store 0.12;
only lance 7 moves to 0.13). Bump the kv-lance pins to `=7.0.0` / `=0.30.0`
so the storage engine resolves consistently on object_store 0.13, and against
the AdaWorldAPI/lance-graph workspace which moved to lance 7 in parallel
(lance-graph PR surrealdb#445). arrow-array/arrow-schema stay 58 (lance 7 keeps arrow ^58).

https://claude.ai/code/session_012SorR8UbtEvYmbX8cXftj7

Author: AdaWorldAPI

surrealdb/core/Cargo.toml

@@ -107,9 +107,9 @@ surrealdb-types = { workspace = true }
 vart.workspace = true
 
 # External KV stores
-lance = { version = "=6.0.0", optional = true }
-lance-index = { version = "=6.0.0", optional = true }
-lancedb = { version = "=0.29.0", optional = true }
+lance = { version = "=7.0.0", optional = true }
+lance-index = { version = "=7.0.0", optional = true }
+lancedb = { version = "=0.30.0", optional = true }
 arrow-array = { version = "58", optional = true }
 arrow-schema = { version = "58", optional = true }
 rocksdb = { workspace = true, optional = true }