Remove deprecated clippy lint

Author: emilk

Cargo.toml

@@ -154,7 +154,6 @@ match_same_arms = "warn"
 match_wild_err_arm = "warn"
 match_wildcard_for_single_variants = "warn"
 mem_forget = "warn"
-mismatched_target_os = "warn"
 mismatching_type_param_order = "warn"
 missing_assert_message = "warn"
 missing_enforced_import_renames = "warn"