Metadata updates from Google v6.2.1 (r680)

* Metadata changes:
 - Updated phone metadata for region code(s): BW, LB, MD, PA, PF, VI, ZM
 - New carrier data for country calling code(s): 507 (en), 961 (en)
 - Updated carrier data for country calling code(s): 267 (en), 373 (en)