chore(deps): update ghcr.io/open-feature/flagd-testbed docker tag to v0.5.2 (#780)

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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -38,7 +38,7 @@ jobs:
 
       services:
         flagd:
-          image: ghcr.io/open-feature/flagd-testbed:v0.5.1
+          image: ghcr.io/open-feature/flagd-testbed:v0.5.2
           ports:
             - 8013:8013
         flagd-unstable: