chore(main): release providers/go-feature-flag 0.2.1

[github-actions[bot]]

:robot: I have created a release beep boop

0.2.1 (2024-09-10)

🐛 Bug Fixes

• Calling err.Error() on nil error causes panic (#579) (4c85501)

🧹 Chore

• add license to module (#554) (abb7657)

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[github-actions[bot]]

:robot: Release is at https://github.com/open-feature/go-sdk-contrib/releases/tag/providers/go-feature-flag/v0.2.1 :sunflower: