docs: replace incorrect uses

Author: scastlara

README.md

@@ -53,7 +53,7 @@ jobs:
           ref: refs/pull/${{ github.event.issue.number }}/merge
 
       - name: Run LGTM Review
-        uses: ./
+        uses: elementsinteractive/lgtm-ai@v1
         with:
           ai-api-key: ${{ secrets.AI_API_TOKEN }}
           git-api-key: ${{ secrets.GITHUB_TOKEN }}