chore(deps): update dependency dev.openfeature.contrib.providers:flagd to v0.5.6 (open-feature#207)

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

Author: renovate[bot]

Diff for: pom.xml

@@ -141,7 +141,7 @@
     <dependency>
       <groupId>dev.openfeature.contrib.providers</groupId>
       <artifactId>flagd</artifactId>
-      <version>0.5.3</version>
+      <version>0.5.6</version>
       <scope>test</scope>
     </dependency>
   </dependencies>