Replace fs-promise with built-in fs/promises module

[hyperupcall]

Checklist

• [x] I have ensured my pull request is not behind the main or master branch of the original repository.
• [x] I have rebased all commits where necessary so that reviewing this pull request can be done without having to merge it first.
• [x] I have written a commit message that passes commitlint linting.
• [x] I have ensured that my code changes pass linting tests.
• [x] I have ensured that my code changes pass unit tests.
• [x] I have described my pull request and the reasons for code changes along with context if necessary.

Description

fs-promise is deprecated and since Node v10.X, there is a built-in fs/promises module (also available with the .promises property) for promise-based file system APIs.

This removes fs-promise and uses the built-in module that is available.

• Closes #147 (spam)

[socket-security[bot]]

Removed dependencies detected. Learn more about Socket for GitHub ↗︎

🚮 Removed packages: fs-promise@2.0.3