chore(deps): update dependency tools/flagd-api-testkit/test-harness to v3.5.0

[renovate]

This PR contains the following updates:

Package	Update	Change
tools/flagd-api-testkit/test-harness	minor	v3.1.0 → v3.5.0

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Release Notes

open-feature/test-harness (tools/flagd-api-testkit/test-harness)

v3.5.0

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✨ New Features

• add @​env-var tag to env-var config scenarios (#​359) (7fb6fa1)
• operators: add error return scenarios for custom operator null fallback (#​342) (eb3fa72)
• update flagd (#​360) (3ff7923)

v3.4.0

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✨ New Features

• add fractional as condition flag (#​354) (fdfac67)
• fractional: mirror nested fractional scenarios to evaluator gherkin suite (#​357) (eaec4d9)

v3.3.0

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✨ New Features

• add nested fractional weight assertion (#​352) (ab939e6)

v3.2.0

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✨ New Features

• fractional: add nested fractional expression gherkin scenarios (#​345) (267a1bf)

v3.1.1

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🐛 Bug Fixes

• evaluator: add @​fractional-v1/@​fractional-v2 tagged examples to fractional scenarios (#​350) (f51f628)

📚 Documentation

• add agents.md with repository guidance for AI agents (#​347) (a18ff40)

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