CI/clippy: Use --workspace flag

The `--all` flag for `cargo clippy` (and `cargo check`) is deprecated in favor of `--workspace`.

Author: Turbo87

.github/workflows/ci.yml

@@ -83,7 +83,7 @@ jobs:
       - uses: Swatinem/[email protected]
 
       - run: cargo fmt --check --all
-      - run: cargo clippy --all-targets --all-features --all
+      - run: cargo clippy --all-targets --all-features --workspace
 
   backend-cargo-deny:
     name: Backend / cargo-deny