Upgrade rake dependency to prevent CVE-2020-8130

[bkabrda]

What does this PR do?

Upgrade rake dependency to prevent CVE-2020-8130

https://github.com/advisories/GHSA-jppv-gw3r-w3q8

Description of the Change

Alternate Designs

Possible Drawbacks

Verification Process

Additional Notes

Release Notes

Review checklist (to be filled by reviewers)

• [ ] Feature or bug fix MUST have appropriate tests (unit, integration, etc...)
• [ ] PR title must be written as a CHANGELOG entry (see why)
• [ ] Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• [ ] PR must have one changelog/ label attached. If applicable it should have the backward-incompatible label attached.
• [ ] PR should not have do-not-merge/ label attached.
• [ ] If Applicable, issue must have kind/ and severity/ labels attached at least.

[bkabrda]

After some evaluation, I'm going to close this. The CVE doesn't hit our users as rake is only a test dependency and it seems that nobody could misuse this in our CI pipeline.