Pin to cargo deny 0.16.1 to avoid MSRV issue (#8158)

Causes our ci to fail because we're on an older Rust version than what
is required by 0.16.2

I'm pretty sure this happened unintentionally, see:
* EmbarkStudios/cargo-deny#720

scripts/ci/rust_checks.py

@@ -156,7 +156,9 @@ def cargo_deny(timings: list[Timing]) -> None:
     # Note: running just `cargo deny check` without a `--target` can result in
     # false positives due to https://github.com/EmbarkStudios/cargo-deny/issues/324
     # Installing is quite quick if it's already installed.
-    timings.append(run_cargo("install", "--locked cargo-deny"))
+    #
+    # `cargo-deny` 0.16.2 raises MSRV 1.81.0, we're not there yet.
+    timings.append(run_cargo("install", "--locked [email protected]"))
     timings.append(run_cargo("deny", "--all-features --log-level error --target aarch64-apple-darwin check"))
     timings.append(run_cargo("deny", "--all-features --log-level error --target i686-pc-windows-gnu check"))
     timings.append(run_cargo("deny", "--all-features --log-level error --target i686-pc-windows-msvc check"))