Update Inter-Region Latency Tutorial to use latest pip version
Update Inter-Region Latency Tutorial to use latest pip version

PiperOrigin-RevId: 320020802

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