Update xprof version to 2.21.1. by @Matt-Hurd in https://github.com/openxla/xprof/pull/1899
Automatically select the single available host when no host is specified. by @Matt-Hurd in https://github.com/openxla/xprof/pull/1892
Add a new data service interface for getting source info for pallas call, not implemented yet, thus no-op. by @zzzaries in https://github.com/openxla/xprof/pull/1878
Full Changelog: https://github.com/openxla/xprof/compare/xprof-v2.21.0...xprof-v2.21.1