www/py-boto3 update requires botocore >= 1.12.142
```
devel/py-botocore: Update to 1.12.142
- Update RUN_DEPENDS to match setup.py versions
- Document RUN_DEPENDS max versions to ease future QA
Reviewed_by: bhughes
Approved by: bhughes (maintainer)
Differential_Revision: DXXXX20161
```