Consume latest toolkit and fix dangling promise bug

[chkimes]

This PR updates to the latest actions/cache version published from the toolkit, which contains https://github.com/actions/toolkit/pull/1484 and should fix #810.

Description

See https://github.com/actions/toolkit/pull/1484 for details on the Azure blob fixes. The cache action contains an additional fix for dangling promises that prevents the process from ending despite the cache being fully restored.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation (add or update README or docs)

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[bbrzoska]

Hey @cwille97, any chance this fix can get released/tagged anytime soon? 🙏