Use a single library for HTTP requests in jobs/utils

#### Current behavior:
In jobs/utils.py, two libraries (urllib and requests) are being used for the same purpose

#### Expected behavior:
Only one library (preferably `requests`) should be used.

Read jobs/utils.py and identify the urllib and requests call sites used for HTTP requests. Consolidate those uses on requests, then verify that jobs/utils.py no longer relies on urllib and that the existing job behavior remains intact.

Written by the indexing model from the issue text.