benchmarks/stress-ng: Update to 0.10.11
https://kernel.ubuntu.com/git/cking/stress-ng.git/commit/?id=a8ae150eee8990217e10076bb63d9603f821c4f8
https://kernel.ubuntu.com/git/cking/stress-ng.git/commit/?id=d77d06276bbf823320ebe24081102a6ca777f1ec
https://kernel.ubuntu.com/git/cking/stress-ng.git/commit/?id=2e66804bee3eaac06e97a6f3dbcea61956aafb8d
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