fix build

Author: oldGreg5

.github/workflows/rust.yml

@@ -20,7 +20,7 @@ on:
        - 'book/**'
 
 env:
-  RUST_LATEST_STABLE_VERSION: 1.71
+  RUST_LATEST_STABLE_VERSION: 1.87.0
   CARGO_TERM_COLOR: always
   RUSTFLAGS: -D warnings
   RUST_BACKTRACE: 1