chore(deps): update dependency open-feature/test-harness to v0.5.6

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
open-feature/test-harness	patch	v0.5.4 -> v0.5.6

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Release Notes

open-feature/test-harness (open-feature/test-harness)

### [`v0.5.6`](https://togithub.com/open-feature/flagd-testbed/releases/tag/v0.5.6) [Compare Source](https://togithub.com/open-feature/test-harness/compare/v0.5.5...v0.5.6) ##### Bug Fixes - correct assertions for shorthand targeting ([#​135](https://togithub.com/open-feature/flagd-testbed/issues/135)) ([5b685c2](https://togithub.com/open-feature/flagd-testbed/commit/5b685c2d1f2dc36e83923fb00e492e64b278ee41)) ### [`v0.5.5`](https://togithub.com/open-feature/flagd-testbed/releases/tag/v0.5.5) [Compare Source](https://togithub.com/open-feature/test-harness/compare/v0.5.4...v0.5.5) ##### Features - fractional non-percentage and shorthand ([#​132](https://togithub.com/open-feature/flagd-testbed/issues/132)) ([c673bf0](https://togithub.com/open-feature/flagd-testbed/commit/c673bf0fb6efca9d9675dd751ddd4459f87d86b4)) ##### Bug Fixes - **deps:** update golang.org/x/exp digest to [`4c93da0`](https://togithub.com/open-feature/test-harness/commit/4c93da0) ([#​125](https://togithub.com/open-feature/flagd-testbed/issues/125)) ([7d9c634](https://togithub.com/open-feature/flagd-testbed/commit/7d9c634e009365458bda370b51dc0aa6e9b81e5d)) - **deps:** update golang.org/x/exp digest to [`7f521ea`](https://togithub.com/open-feature/test-harness/commit/7f521ea) ([#​127](https://togithub.com/open-feature/flagd-testbed/issues/127)) ([5025939](https://togithub.com/open-feature/flagd-testbed/commit/50259398a86e8547358025d92196c4785d51a543)) - **deps:** update module buf.build/gen/go/open-feature/flagd/grpc/go to v1.3.0-20240215170432-1e611e2999cc.3 ([#​121](https://togithub.com/open-feature/flagd-testbed/issues/121)) ([c9e0be3](https://togithub.com/open-feature/flagd-testbed/commit/c9e0be36e89ad33aa99b8e32b40d67e9bf350f88)) - **deps:** update module buf.build/gen/go/open-feature/flagd/grpc/go to v1.4.0-20240215170432-1e611e2999cc.1 ([#​128](https://togithub.com/open-feature/flagd-testbed/issues/128)) ([b69dea2](https://togithub.com/open-feature/flagd-testbed/commit/b69dea2277c528ac964e7287e69a43b2cbc8cdc4)) - **deps:** update module buf.build/gen/go/open-feature/flagd/protocolbuffers/go to v1.34.1-20240215170432-1e611e2999cc.1 ([#​122](https://togithub.com/open-feature/flagd-testbed/issues/122)) ([b16fb9b](https://togithub.com/open-feature/flagd-testbed/commit/b16fb9ba6c962f56db6e47f0d8387030e4dcfea0)) - **deps:** update module buf.build/gen/go/open-feature/flagd/protocolbuffers/go to v1.34.2-20240215170432-1e611e2999cc.2 ([#​130](https://togithub.com/open-feature/flagd-testbed/issues/130)) ([690a9dd](https://togithub.com/open-feature/flagd-testbed/commit/690a9ddc2f57156e0abccf3edf9aca40d9573fe9)) - **deps:** update module google.golang.org/grpc to v1.64.0 ([#​124](https://togithub.com/open-feature/flagd-testbed/issues/124)) ([91cb477](https://togithub.com/open-feature/flagd-testbed/commit/91cb47786290ffc611e7970211a7ff63799b85c8))

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