getdeps: update zstd to 1.4.5
getdeps: update zstd to 1.4.5

Reviewed By: krallin

Differential Revision: D23757084

fbshipit-source-id: 7e49228805e272064ad52d43141b5815eba4190a

facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro