Fixing workaround for CamelCase renderer issue

[magul]

Description:

See: vbabiy/djangorestframework-camel-case#26

New imports / dependencies:

• djangorestframework-camel-case==1.0b1

Unit Tests:

• backend/apps/volontulo/tests/views/api/offers/test_list.py:_TestOffersListAPIView
• backend/apps/volontulo/tests/views/api/organizations/test_list.py:_TestOrganizationsListAPIView

[codecov-io]

Codecov Report

Merging #653 into master will decrease coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #653      +/-   ##
==========================================
- Coverage   91.89%   91.88%   -0.02%     
==========================================
  Files          81       81              
  Lines        2665     2661       -4     
  Branches        2        2              
==========================================
- Hits         2449     2445       -4     
  Misses        213      213              
  Partials        3        3

Impacted Files	Coverage Δ
...apps/volontulo/tests/views/api/offers/test_list.py	100% <100%> (ø)	⬆️
...lontulo/tests/views/api/organizations/test_list.py	100% <100%> (ø)	⬆️

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