Remove tempfile as cargo machete say it is unused

Author: skejserjensen

crates/modelardb_test/Cargo.toml

@@ -27,5 +27,4 @@ modelardb_types = { path = "../modelardb_types" }
 modelardb_storage = { path = "../modelardb_storage" }
 object_store = { workspace = true, features = ["aws", "azure"] }
 rand.workspace = true
-tempfile.workspace = true
 url.workspace = true