Update mktemp to use NamedTemporaryFile

[mark-jones-rga]

Update mktemp in testing frameworks to use NamedTemporary file https://nvd.nist.gov/vuln/detail/CVE-2022-23563.

I have the code updated in the spots and tested. How can I submit the PR?

[MatthewJohn]

Hey - Feel free to submit a PR here. I've been upgrading gitlab so will get the PR merged once it's back up :)

[mark-jones-rga]

I think I did it right... lol. I accidentally had a couple linting modifications in one of the file. Feel free to discard those.

[MatthewJohn]

Created gitlab issue: https://gitlab.dockstudios.co.uk/pub/terrareg/-/issues/551
gitlab-issue-id:551