fix: REST client should not close after stream request

[evansims]

Description

This is a minor bug fix to the new stream method added to the Python SDK's REST client in 0.9.1: the pool shouldn't close after the request concludes, as the same pool can continue to be used for future requests.

References

Generated from openfga/sdk-generator#491

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.37%. Comparing base (2db7d04) to head (d0f0ac0).

❌ Your project status has failed because the head coverage (70.37%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #172      +/-   ##
==========================================
- Coverage   70.38%   70.37%   -0.01%     
==========================================
  Files         134      134              
  Lines       10794    10792       -2     
==========================================
- Hits         7597     7595       -2     
  Misses       3197     3197              

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