Avoid upcoming cache action deprecation

[gjtorikian]

This just started popping up in my logs:

Input `save-always` has been deprecated with message

save-always does not work as intended and will be removed in a future release.
A separate `actions/cache/restore` step should be used instead.
See https://github.com/actions/cache/tree/main/save#always-save-cache for more details.

GitHub recently removed flagged the argument as deprecated: actions/cache#1452

This PR is an attempt to work around the upcoming breakage.

[ianks]

ty!