fix: Update env variable for model caching timeout

[sjrl]

The environment variable used to set the timeout for the model caching step had a typo in it from the maintainers of actions/cache@v3, which is why it has not been working (see comment here).

Related Issues

• related to Investigate failures on the HF models caching job #3146

Proposed Changes:

Fix the typo in the variable name.

How did you test it?

No easy way to test. We need to wait for a scenario where the timeout will kick in during the CI

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added tests that demonstrate the correct behavior of the change
• I've used the conventional commit convention for my PR title
• I documented my code
• I ran pre-commit hooks and fixed any issue

[sjrl]

Hey @vblagoje I would appreciate a review of this when you have the chance :) Hopefully this brings to a close the HF model caching issue.