Update external rapidjson dependency to commit 02673bec.
Update external rapidjson dependency to commit 02673bec.

This revision contains a bugfix for an out-of-bound read:
https://github.com/miloyip/rapidjson/commit/02673bec

dlyongemallo/libaddressinput,roubert/libaddressinput,mcanthony/libaddressinput,roubert/libaddressinput,google/libaddressinput,parastoog/my-libaddressinput,google/libaddressinput,dlyongemallo/libaddressinput,dlyongemallo/libaddressinput,google/libaddressinput,googlei18n/libaddressinput,googlei18n/libaddressinput,googlei18n/libaddressinput,parastoog/my-libaddressinput,mcanthony/libaddressinput,mcanthony/libaddressinput,parastoog/my-libaddressinput,roubert/libaddressinput