chore: Keep `cleanup` files to accommodate different build scenarios · duckdb/duckdb-r@21b25be

R CMD check found NOTEs

Process completed with exit code 1.

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.