fix(deps): update dependency io.grpc:grpc-stub to v1.56.0

Author: renovate[bot]

providers/flagd/pom.xml

@@ -52,7 +52,7 @@
         <dependency>
             <groupId>io.grpc</groupId>
             <artifactId>grpc-stub</artifactId>
-            <version>1.55.1</version>
+            <version>1.56.0</version>
         </dependency>
 
         <dependency>