Pull in anyhow's new Error::provide support

Cargo.toml

@@ -15,7 +15,7 @@ rust-version = "1.56"
 thiserror-impl = { version = "=1.0.45", path = "impl" }
 
 [dev-dependencies]
-anyhow = "1.0.71"
+anyhow = "1.0.73"
 ref-cast = "1.0.18"
 rustversion = "1.0.13"
 trybuild = { version = "1.0.81", features = ["diff"] }

tests/test_backtrace.rs

@@ -136,7 +136,7 @@ pub mod structs {
         let error = AnyhowBacktrace {
             source: anyhow::Error::msg("..."),
         };
-        assert!(error::request_ref::<Backtrace>(&error).is_some() || true); // FIXME
+        assert!(error::request_ref::<Backtrace>(&error).is_some());
 
         let error = BoxDynErrorBacktrace {
             source: Box::new(PlainBacktrace {