chore(deps): update ghcr.io/open-feature/sync-testbed docker tag to v0.5.19

[renovate]

This PR contains the following updates:

Package	Update	Change
ghcr.io/open-feature/sync-testbed	patch	v0.5.13 -> v0.5.19

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Release Notes

open-feature/flagd-testbed (ghcr.io/open-feature/sync-testbed)

v0.5.19

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Features

• add certificates for ssl test and an ssl test image (#​168) (8177dc0)

v0.5.18

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Features

• add yaml file with current version, to easier fetch images corr… (#​169) (ac1263a)

v0.5.17

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Features

• add dedicated gherkin file for events (and grace attempts) (#​164) (22ab80c)

v0.5.16

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Features

• rework config gherkin file (#​162) (b987798)

v0.5.15

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Bug Fixes

• remove comment for release please (#​157) (3d4866d)

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