Updating Cocofest to last Bioptim version

[Kev1CO]

All Submissions:

• Have you followed the guidelines in our Contributing document [docs/contribution.md]?
• Have you checked to ensure there aren't other open [Pull Requests] for the same update/change?
• Have you opened/linked the issue related to your pull request?
• Have you used the tag [WIP] for ongoing changes, and removed it when the pull request was ready?
• When ready to merge, have you sent a comment pinging @Kev1CO in it?

New Feature Submissions:

1. Does your submission pass the tests (if not please explain why this is intended)?
2. Did you write a proper documentation (docstrings and ReadMe)
3. Have you linted your code locally prior to submission (using the command: black . -l120 --exclude "external/*")?

Changes to Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new examples for your core changes, as applicable?
• Have you written new tests for your core changes, as applicable?

---

This change is 

[codecov]

Codecov Report

❌ Patch coverage is 96.10390% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.52%. Comparing base (4e83c1a) to head (e131cd2).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
cocofest/models/veltink1992/veltink1992.py	84.84%	5 Missing ⚠️
cocofest/models/state_configure.py	90.90%	3 Missing ⚠️
cocofest/custom_objectives.py	66.66%	1 Missing ⚠️
cocofest/models/dynamical_model.py	98.11%	1 Missing ⚠️
cocofest/models/fes_model.py	85.71%	1 Missing ⚠️
cocofest/models/hmed2018/hmed2018.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #21      +/-   ##
==========================================
- Coverage   67.52%   67.52%   -0.01%     
==========================================
  Files          38       38              
  Lines        2947     3002      +55     
==========================================
+ Hits         1990     2027      +37     
- Misses        957      975      +18     

Flag	Coverage Δ
unittests	67.52% <96.10%> (-0.01%)	⬇️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.