remove constraint on enum GroupType

[seb5g]

Higher level saving object should enforce this, see pymodaq->module_saving

[codecov]

Codecov Report

Attention: Patch coverage is 36.17021% with 30 lines in your changes missing coverage. Please review.

Project coverage is 76.46%. Comparing base (05c27c4) to head (ff79484).
Report is 3 commits behind head on 5.0.x_dev.

Files with missing lines	Patch %	Lines
src/pymodaq_data/h5modules/saving.py	27.50%	29 Missing ⚠️
src/pymodaq_data/h5modules/backends.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##           5.0.x_dev      #38      +/-   ##
=============================================
- Coverage      76.90%   76.46%   -0.44%     
=============================================
  Files             17       17              
  Lines           3762     3790      +28     
=============================================
+ Hits            2893     2898       +5     
- Misses           869      892      +23     

☔ 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.