build: remove unused anyhow dependency

third_party/crates/anyhow-1.0.104/tests/test_backtrace.rs

@@ -1,15 +0,0 @@
-#![allow(clippy::let_underscore_untyped)]
-
-#[rustversion::not(nightly)]
-#[ignore = "requires nightly"]
-#[test]
-fn test_backtrace() {}
-
-#[rustversion::nightly]
-#[test]
-fn test_backtrace() {
-    use anyhow::anyhow;
-
-    let error = anyhow!("oh no!");
-    let _ = error.backtrace();
-}