Fix ViewSet attribute to invoke filtersets

[rafa-garcia]

django-filter renamed ViewSet.filter_class to ViewSet.filterset_class some time ago. The deprecated attribute name remained valid until v22 but now results in filters not being applied.

To do:

• Change has a jira ticket that has the correct status.
• Changelog entry added.

[codecov]

Codecov Report

Base: 97.39% // Head: 97.39% // No change to project coverage 👍

Coverage data is based on head (77e9aeb) compared to base (37fb10e).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1112   +/-   ##
========================================
  Coverage    97.39%   97.39%           
========================================
  Files          132      132           
  Lines         4675     4675           
========================================
  Hits          4553     4553           
  Misses         122      122           

Impacted Files	Coverage Δ
company/views.py	99.59% <100.00%> (ø)
...management/commands/import_metadata_source_data.py	100.00% <100.00%> (ø)
dataservices/views.py	100.00% <100.00%> (ø)

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[ecbm]

👍