add @master ref

Author: kkartunov

.github/workflows/code_reviewer.yml

@@ -14,7 +14,7 @@ jobs:
         uses: actions/checkout@v3
 
       - name: TC AI PR Reviewer
-        uses: topcoder-platform/tc-ai-pr-reviewer
+        uses: topcoder-platform/tc-ai-pr-reviewer@master
         with:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # The GITHUB_TOKEN is there by default so you just need to keep it like it is and not necessarily need to add it as secret as it will throw an error. [More Details](https://docs.github.com/en/actions/security-guides/automatic-token-authentication#about-the-github_token-secret)
           LAB45_API_KEY: ${{ secrets.LAB45_API_KEY }}