Modified sysbench.py to install sysbench through Github.
Modified sysbench.py to install sysbench through Github.

PiperOrigin-RevId: 452795533

GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker,GoogleCloudPlatform/PerfKitBenchmarker