Link to cargo-outdated bug

Author: dtolnay

.github/workflows/ci.yml

@@ -101,4 +101,4 @@ jobs:
       - uses: actions/checkout@v4
       - uses: dtolnay/install@cargo-outdated
       - run: cargo outdated --workspace --exit-code 1
-        continue-on-error: true
+        continue-on-error: true  # https://github.com/kbknapp/cargo-outdated/issues/389