clippy: Only enforce 'correctness' lints, just print the rest

Only the 'correctness' category of lints are 'deny' by default. This is
the only clippy lints we want to enforce for now. The other ones we just
want to print in the logs. So remove any --deny and --allow arguments.
See discussion in #1410.

.github/workflows/CICD.yml

@@ -27,7 +27,7 @@ jobs:
       uses: actions-rs/cargo@v1
       with:
         command: clippy
-        args: --all-targets --all-features -- --deny warnings --allow clippy::new-without-default --allow clippy::match-bool --allow clippy::if_same_then_else
+        args: --all-targets --all-features
     - name: Test
       uses: actions-rs/cargo@v1
       with: