Fix typo in folder name

[andrea-pasquale]

As title says.
Thanks @rodolfocarobene for letting me know.

Checklist:

• Reviewers confirm new code works as expected.
• Tests are passing.
• Coverage does not decrease.
• Documentation is updated.

[codecov]

Codecov Report

Merging #424 (41df2b8) into main (e251c80) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #424   +/-   ##
=======================================
  Coverage   96.77%   96.77%           
=======================================
  Files          48       48           
  Lines        3128     3128           
=======================================
  Hits         3027     3027           
  Misses        101      101           

Flag	Coverage Δ
unittests	96.77% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...erization/flux_dependence/qubit_flux_dependence.py	100.00% <ø> (ø)
...ation/flux_dependence/resonator_flux_dependence.py	100.00% <ø> (ø)
...rotocols/characterization/flux_dependence/utils.py	100.00% <ø> (ø)
src/qibocal/protocols/characterization/__init__.py	100.00% <100.00%> (ø)

[Jacfomg]

I'm mad at myself for not seeing it before hahaha.