remove imio from dependencies

[alessandrofelder]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?

We still depend on (the archived and obsolete) imio in pyproject.toml,
but it's not used anywhere, since #346.

What does this PR do?
Remove imio from dependencies in pyproject.toml

References

Closes #384

How has this PR been tested?

Double-checked that CI passes.

Is this a breaking change?

No

Does this PR require an update to the documentation?

No

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.71%. Comparing base (78c0426) to head (367bcfe).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #385   +/-   ##
=======================================
  Coverage   86.71%   86.71%           
=======================================
  Files          27       27           
  Lines        1219     1219           
=======================================
  Hits         1057     1057           
  Misses        162      162           

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