Stop using process.umask()

[aduh95]

Refs: nodejs/node#32321

Summary: process.umask() (no args) is deprecated and will be removed.

I couldn't quite divine what this lib uses process.umask() for but in most cases you don't need to deal with the umask directly - the operating system will apply it automatically.

Example:

const mode = 0o777 & ~process.umask();
fs.mkdirSync(dir, mode);

Computing the file mode that way is superfluous, it can be replaced with just this:

fs.mkdirSync(dir, 0o777);

[malept]

🤷‍♂️ This is the commit that introduced it: 6ad307a