Use numbers where appropriate

Created by: at7

Requirements

NA

Description

Responding to @premanand17 suggestion to make use of json number types consistent across the vep tests. (https://www.ebi.ac.uk/panda/jira/browse/ENSVAR-1110)

Use case

NA

Benefits

Ensure consistency

Possible Drawbacks

NA

Testing

Done. tests pass.

Changelog

NA