Fix copying

Author: mdboom

bench_runner/templates/_benchmark.src.yml

@@ -117,6 +117,7 @@ jobs:
         if: ${{ steps.should_run.outputs.should_run != 'false' }}
         run: |
           # Copy the build products to a place that libraries can find them.
+          cd cpython
           Copy-Item -Path $env:BUILD_DEST -Destination "libs" -Recurse
       - name: Install pyperformance
         if: ${{ steps.should_run.outputs.should_run != 'false' }}