chore(main): release open-feature 0.3.1

[github-actions]

🤖 I have created a release beep boop

0.3.1 (2026-09-18)

🧹 Chore

• deps: update actions-rust-lang/setup-rust-toolchain action to v2 (#142) (9dacd98)
• deps: update actions/checkout action to v7 (#133) (17ef17d)
• deps: update amannn/action-semantic-pull-request action to v6.1.1 (#144) (679d7fe)
• deps: update marocchino/sticky-pull-request-comment action to v3 (#130) (ca0ef3f)
• deps: update rust crate darling to 0.24.0 (#138) (78eda39)
• deps: update rust crate mockall to 0.15.0 (#134) (d6af85e)
• deps: update rust crate syn to v2.0.119 (#122) (8cb7217)
• deps: update taiki-e/install-action action to v2.87.12 (#147) (bce1220)
• deps: update taiki-e/install-action action to v2.87.13 (#148) (3275d67)
• extend from org renovate config (#143) (397b2fe)

📚 Documentation

• fix inaccuracies in README code examples and descriptions (#129) (abe65b8)

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