fix: upgrade @babel/core from 7.8.7 to 7.9.0 (#1362)

Snyk has created this PR to upgrade @babel/core from 7.8.7 to 7.9.0.

See this package in NPM:
https://www.npmjs.com/package/@babel/core

See this project in Snyk:
https://app.snyk.io/org/cds-snc/project/37642e46-d4bb-4ae9-851f-ab09a7ae7243?utm_source=github&utm_medium=upgrade-pr

Co-authored-by: Victoria Chan <39972942+victoriachanimal@users.noreply.github.com>