maybe this will work?

Signed-off-by: Matthew Fisher <matt.fisher@fermyon.com>

.github/workflows/code-review.yml

@@ -42,7 +42,7 @@ jobs:
                       },
                       {
                           "role": "user",
-                          "content": "GIT DIFF:\n\n```\n'\"$escaped_diff\"'\n```\n"
+                          "content": "GIT DIFF:\n\n```\n'"$(cat ${{ steps.git-diff.outputs.raw-diff-path }})"'\n```\n"
                       }
                   ]
               }')