build: remove unused anyhow dependency

third_party/crates/anyhow-1.0.104/tests/ui/empty-ensure.stderr

@@ -1,12 +0,0 @@
-error: unexpected end of macro invocation
- --> tests/ui/empty-ensure.rs:4:5
-  |
-4 |     ensure!();
-  |     ^^^^^^^^^ missing tokens in macro arguments
-  |
-note: while trying to match meta-variable `$cond:expr`
- --> src/ensure.rs
-  |
-  |     ($cond:expr $(,)?) => {
-  |      ^^^^^^^^^^
-  = note: this error originates in the macro `$crate::__parse_ensure` which comes from the expansion of the macro `ensure` (in Nightly builds, run with -Z macro-backtrace for more info)