Update API key env var name for Anthropic

Author: strickvl

.github/workflows/claude.yml

@@ -61,7 +61,7 @@ jobs:
         id: claude
         uses: anthropics/claude-code-action@v1
         with:
-          anthropic_api_key: ${{ secrets.CLAUDE_GITHUB_ACTIONS_ANTHROPIC_KEY }}
+          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
           track_progress: true
 
           # This is an optional setting that allows Claude to read CI results on PRs