Fix unit_evals.yml (#41377)

Release Notes:

- N/A

.github/workflows/unit_evals.yml

@@ -63,7 +63,7 @@ jobs:
 
       - name: Run unit evals
         shell: bash -euxo pipefail {0}
-        run: cargo nextest run --workspace --no-fail-fast --features eval --no-capture -E 'test(::eval_)'
+        run: cargo nextest run --workspace --no-fail-fast --features unit-eval --no-capture -E 'test(::eval_)'
         env:
           ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}