Temporarily allow clippy::derive_partial_eq_without_eq

The lint has known false positives and has been moved to the nursery
on the nightly compiler:

  rust-lang/rust-clippy#9530

We’ll allow the lint for now until this change lands in a stable
compiler.

.github/workflows/build.yml

@@ -100,8 +100,11 @@ jobs:
 
  - uses: Swatinem/rust-cache@v2
 
+ # Remove "-A clippy::derive_partial_eq_without_eq" below when
+ # https://github.com/rust-lang/rust-clippy/issues/9530 is in a
+ # stable release.
  - name: Clippy with default lints
- run: cargo clippy
+ run: cargo clippy -- -A clippy::derive_partial_eq_without_eq
 
  - name: Lint for left-over debug prints
  run: cargo clippy -- -D clippy::print_stdout -D clippy::print_stderr