docs: Update README for server-side batch check

[jimmyjames]

Description

Update docs in README for batch check. Also put back some dependency updates that didn't yet get synced from generator repo.

References

openfga/sdk-generator#486
#141

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 32.78%. Comparing base (fdab6d2) to head (cc16f05).

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #142   +/-   ##
=========================================
  Coverage     32.78%   32.78%           
  Complexity      973      973           
=========================================
  Files           182      182           
  Lines          6872     6872           
  Branches        764      764           
=========================================
  Hits           2253     2253           
  Misses         4512     4512           
  Partials        107      107           

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