chore(deps): update ghcr.io/open-feature/flagd-testbed-unstable docker tag to v0.5.6 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ghcr.io/open-feature/flagd-testbed-unstable	service	patch	v0.5.5 -> v0.5.6
ghcr.io/open-feature/flagd-testbed-unstable		patch	v0.5.5 -> v0.5.6

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