chore: stabilize transitive flagd deps

[toddbaert]

This allows us to express transitive dep graphs that will allow us to handle breaking changes, as discussed here.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.94%. Comparing base (6b7c78e) to head (6ba8665).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #387      +/-   ##
==========================================
- Coverage   96.14%   95.94%   -0.20%     
==========================================
  Files          47       33      -14     
  Lines        1737     1135     -602     
==========================================
- Hits         1670     1089     -581     
+ Misses         67       46      -21     

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[gemini-code-assist]

Code Review

This pull request prepares the project for a 1.0.0 release by configuring release-please and updating dependency constraints for 'openfeature-flagd-core' and 'openfeature-flagd-api'. Feedback was provided to adjust the version ranges to include the current 0.1.0 version, as pinning to 1.0.0 immediately would cause build failures in environments using workspace resolution.