Remove abandoned dependency

[Ed Reel]

What is the best way to remove this warning?

Package container-interop/container-interop is abandoned, you should avoid using it. Use psr/container instead.

[fridde]

I just had encountered the same issue.
But the simple solution is:

Update league/container to anything above 3.0.

[Phil Bennett]

@uberhacker as @fridde says, that package has been removed from v3+