tune 1.2.1

• Addressed issue in int_pctl() where the function would error when parallelized using makePSOCKcluster() (#885).

• Addressed issue where tuning functions would raise the error object 'iteration' not found with plan(multisession) and the control option parallel_over = "everything" (#888).

Note that this GitHub release is a re-release with the tag v1.2.1, corresponding to the package version that arrived on CRAN on 2024-04-18. The previous GitHub release with this tag did not match the version released to CRAN. Closes #897.