chore(deps): update ghcr.io/open-feature/sync-testbed-unstable docker tag to v0.5.2 (#783)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
           ports:
             - 9090:9090
         sync-unstable:
-          image: ghcr.io/open-feature/sync-testbed-unstable:v0.5.1
+          image: ghcr.io/open-feature/sync-testbed-unstable:v0.5.2
           ports:
             - 9091:9090