Bump CodSpeedHQ/action from 3 to 4 (#1805)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: David Hewitt <[email protected]>

Author: dependabot[bot]

.github/workflows/codspeed.yml

@@ -60,6 +60,7 @@ jobs:
         run: uv pip install ${{ steps.pgo-wheel.outputs.wheel }} --force-reinstall
 
       - name: Run CodSpeed benchmarks
-        uses: CodSpeedHQ/action@v3
+        uses: CodSpeedHQ/action@v4
         with:
+          mode: instrumentation
           run: uv run --group=codspeed pytest tests/benchmarks/ --codspeed