Update CodSpeed GitHub Action

Author: MarshalX

.github/workflows/codspeed.yml

@@ -77,7 +77,8 @@ jobs:
         run: uv pip install ${{ steps.pgo-wheel.outputs.path }} --force-reinstall
 
       - name: Run CodSpeed benchmarks.
-        uses: CodSpeedHQ/action@v3
+        uses: CodSpeedHQ/action@v4
         with:
+          mode: instrumentation
           token: ${{ secrets.CODSPEED_TOKEN }}
           run: uv run --group=codspeed pytest . --codspeed -n auto