ci(offchain): disable lints for deferred warnings

The following outstanding warnings were suppressed while we amend the code
to meet the linter requirements:

- https://rust-lang.github.io/rust-clippy/master/index.html#/new_ret_no_self
- https://rust-lang.github.io/rust-clippy/master/index.html#/module_inception

.github/workflows/code-quality.yml

@@ -48,4 +48,4 @@ jobs:
         run: cargo fmt --all -- --check
 
       - name: Run linter
-        run: cargo clippy
+        run: cargo clippy -- -A clippy::module_inception -A clippy::new_ret_no_self