Update removed stdlib modules

[fridewald]

#542 Remove concepts that focus on removed modules from the stdlib.

I moved the associated exercises to the practice folder as exercises cannot be removed. https://exercism.org/docs/building/tracks/deprecated-exercises

[lpil]

Thank you!

This will need to be merged at the same time as the packages versions and Gleam versions are updated, so we'll need to update all the exercises rather than just these ones.

[fridewald]

@lpil So just to understand this correctly, the approach would be

• to update the exercism_test_runner to the latest stdlib version
• release the package with a new version
• merge this pr (with all exercises updated to latest stdlib)

For me, that would mean I can prepare the updates in the gleam-test-runner repo and here? And you'd have to do the synchronized merge?

[fridewald]

I updated the exercises and examples to use the newer stdlib. To test I locally run the bin/test script using the changes from the other PR.

If I understand it correctly, after the runner PR is merged, we can run the bin/sync-exercise-project-configs script to update the all the exercise packages?

Hope this will then run smoothly as the examples are already updated