fix(deps): update dependency io.grpc:grpc-protobuf to v1.56.0 (#341)

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

Author: renovate[bot]

providers/flagd/pom.xml

@@ -46,7 +46,7 @@
         <dependency>
             <groupId>io.grpc</groupId>
             <artifactId>grpc-protobuf</artifactId>
-            <version>1.55.1</version>
+            <version>1.56.0</version>
         </dependency>
 
         <dependency>