Update file_system dependency

[nshafer]

When trying to add this module to an existing phoenix application, there is an unsolvable dependency issue:

$ mix deps.get
Resolving Hex dependencies...
Resolution completed in 0.215s
Because "the lock" specifies file_system 1.0.0 and every version of phoenix_copy depends on file_system ~> 0.2, the lock is incompatible with phoenix_copy.
And because your app depends on the lock, no version of phoenix_copy is allowed.
So, because your app depends on phoenix_copy ~> 0.1.3, version solving failed.
** (Mix) Hex dependency resolution failed

The reason that "file_system" is locked to 1.0.0 is because "phoenix_live_reload" has a requirement of {:file_system, "~> 0.2.10 or ~> 1.0"} so 1.0.0 which was published Nov 09, 2023 is being installed.

This PR simply updates the dep line from {:file_system, "~> 0.2"} to {:file_system, "~> 0.2 or ~> 1.0"} so that it will work when added to old or new projects. The changes in "file_system" seem to be pretty minor, and the 1.0.0 was just since it has been stable for years and Jose Valim asked for it.

I unlocked the dep so that tests would run, and also updated ex_doc's locked version so that the generated documentation is updated to the latest styles. I left junit_formatter alone since that's related to your CI.

Thanks for the lib!

[aj-foster]

Awesome, thank you! ❤️

[aj-foster]

This change has been released in version 0.1.4.

[nshafer]

Thanks for quick turnaround!