Chore: bumping enterprise version to 4.20.1

[pmakwana93]

Description

Chore: bumping enterprise version to 4.20.1 JIRA: https://2u-internal.atlassian.net/browse/ENT-9059

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[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.