TSLint nx-enforce-module-boundaries rule leaks file handles via mtime function

[undeadcat]

Here a file descriptor is opened, but not closed.

Originally reported in the WebStorm issue tracker as WEB-32078 when using TSLint with WebStorm.

This is a problem on Windows where it blocks users from saving files.
A project to reproduce the issue in the IDE is attached here.

If you wanted a standalone repro, you could write a simple console app that invokes lastModifiedAmongProjectFiles, break in the debugger after the function completes, and inspect the process handles using procexp or handle.exe.

[github-actions]

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