Revert "Run cargo-outdated on workspace root for now"

This reverts commit 2944bc6.

Author: dtolnay

.github/workflows/ci.yml

@@ -100,5 +100,4 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - uses: dtolnay/install@cargo-outdated
-      - run: cargo outdated --exit-code 1
       - run: cargo outdated --workspace --exit-code 1