fix(ad): pin grpc-netty-shaded to gRPC stack version

flagd:0.13.1 transitively pulls grpc-netty-shaded:1.79.0 which doesn't
implement ServerImplBuilder.buildClientTransportServers(List, MetricRecorder)
added in gRPC 1.81.0, causing AbstractMethodError at startup.

Add an explicit grpc-netty-shaded dependency at ${grpcVersion} to align it
with the rest of the gRPC stack.

Author: cyrille-leclerc

CHANGELOG.md

@@ -10,7 +10,10 @@ the release.
 * [ad] Expose a Prometheus `/metrics` endpoint (default port `9465`) using the
   Prometheus Java client library, with a custom counter
   `demo_ad_served_total{category}`, and scrape it from the OTel Collector via a
-  new `prometheus/ad` receiver to demo Prometheus metric ingestion.
+  new `prometheus/ad` receiver to demo Prometheus metric ingestion. Also pins
+  `grpc-netty-shaded` to the same version as the rest of the gRPC stack to fix
+  an `AbstractMethodError` caused by the flagd provider pulling an older
+  transitive version.
 * [telemetry-docs] Add a new service to provide telemetry documentation based
   on Weaver
   ([#2794](https://github.com/open-telemetry/opentelemetry-demo/pull/2794))

src/ad/build.gradle

@@ -50,6 +50,7 @@ dependencies {
                 "io.grpc:grpc-protobuf:${grpcVersion}",
                 "io.grpc:grpc-stub:${grpcVersion}",
                 "io.grpc:grpc-netty:${grpcVersion}",
+                "io.grpc:grpc-netty-shaded:${grpcVersion}",
                 "io.grpc:grpc-services:${grpcVersion}",
                 "io.opentelemetry:opentelemetry-api",
                 "io.opentelemetry:opentelemetry-sdk",