build: remove unused anyhow dependency

third_party/crates/anyhow-1.0.104/tests/ui/must-use.stderr

@@ -1,15 +0,0 @@
-error: unused return value of `anyhow::__private::must_use` that must be used
- --> tests/ui/must-use.rs:8:9
-  |
-8 |         anyhow!("it failed");
-  |         ^^^^^^^^^^^^^^^^^^^^
-  |
-note: the lint level is defined here
- --> tests/ui/must-use.rs:1:9
-  |
-1 | #![deny(unused_must_use)]
-  |         ^^^^^^^^^^^^^^^
-help: use `let _ = ...` to ignore the resulting value
-  |
-8 |         let _ = anyhow!("it failed");
-  |         +++++++