chore: updated rust_version in GH actions to 1.87

Author: Eagle941

.github/workflows/build.yml

@@ -2,9 +2,8 @@ name: Push Checks
 on: push
 
 env:
-  RUST_VERSION: 1.74.0 # If this is updated, update `Cargo.toml`.
+  RUST_VERSION: 1.87.0 # If this is updated, update `Cargo.toml`.
   CARGO_TERM_COLOR: always
-  RUSTDOCFLAGS: "-D warnings" # Fail on `cargo doc` warnings.
 
 jobs:
   build:
@@ -93,7 +92,7 @@ jobs:
           ~/.cargo/git/db/
           target/
     - name: Cargo doc
-      run: cargo doc --no-deps --document-private-items --locked
+      run: cargo doc --no-deps --document-private-items --locked -- -D warnings
 
   licensing:
     name: Licenses