Bump helm-rb to address security vuln in Helm

[camertron]

What are you trying to accomplish?

GitHub internal tooling is telling us there's a security vulnerability in the version of Helm that Kuby uses. This PR upgrades to v0.3.0 of helm-rb, which includes a patched version of Helm.

Integration

No updates necessary in production.

List the issues that this change affects.

Partially addresses https://github.com/github/vuln-mgmt/issues/125433 (internal-only)

Risk Assessment

• Low risk the change is small, highly observable, and easily rolled back.
• Medium risk changes that are isolated, reduced in scope or could impact few users. The change will not impact library availability.
• High risk changes are those that could impact customers and SLOs, low or no test coverage, low observability, or slow to rollback.

Accessibility

• No new axe scan violation - This change does not introduce any new axe scan violations.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 83f2dda

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[camertron]

Follow-up: edc7163