RUSTSEC-2018-0017: `tempdir` crate has been deprecated; use `tempfile` instead

[github-actions]

tempdir crate has been deprecated; use tempfile instead

Details
Status	unmaintained
Package	tempdir
Version	0.3.7
URL	rust-lang-deprecated/tempdir#46
Date	2018-02-13

The tempdir crate has been deprecated
and the functionality is merged into tempfile.

See advisory page for additional details.