Update Claude PR Assistant workflow (#179)

Author: ArnavAgrawal03

.github/workflows/claude.yml

@@ -33,5 +33,5 @@ jobs:
         id: claude
         uses: anthropics/claude-code-action@beta
         with:
-          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+          anthropic_api_key: ${{ secrets.CLAUDE_CODE_API_KEY }}