docs: correct v0.9.0 release date

[ewanharris]

Description

We progressed forward in time since I wrote that entry

References

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 69.49%. Comparing base (6145ea6) to head (b123eb5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #158   +/-   ##
=======================================
  Coverage   69.49%   69.49%           
=======================================
  Files         133      133           
  Lines       10554    10554           
=======================================
  Hits         7334     7334           
  Misses       3220     3220           

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