ci: remove obsolete Valgrind setup from CodSpeed workflow

Author: art049

.github/workflows/codspeed.yml

@@ -32,11 +32,7 @@ jobs:
         with:
           python-version: ${{ env.PYTHON_VERSION }}
       - name: Install local version of pytest-codspeed
-        run: |
-          sudo apt-get update
-          sudo apt-get install valgrind -y
-          uv sync --dev
-          sudo apt-get remove valgrind -y
+        run: uv sync --dev
       - name: Run benchmarks
         uses: CodSpeedHQ/action@main
         with: