workflows/eval: run misc job with same merge commit

This was an oversight when we introduced the ability for
`get-merge-commit` to take the pre-computed sha as input.

(cherry picked from commit f5c5bc25ea)

.github/workflows/eval.yml

@@ -378,6 +378,7 @@ jobs:
       - name: Check if the PR can be merged and checkout the merge commit
         uses: ./.github/actions/get-merge-commit
         with:
+          mergedSha: ${{ inputs.mergedSha }}
           merged-as-untrusted: true
 
       - name: Install Nix