Bump io.grpc:grpc-netty-shaded in /end2end-test-examples/echo-client

Bumps [io.grpc:grpc-netty-shaded](https://github.com/grpc/grpc-java) from 1.53.0 to 1.75.0.
- [Release notes](https://github.com/grpc/grpc-java/releases)
- [Commits](grpc/grpc-java@v1.53.0...v1.75.0)

---
updated-dependencies:
- dependency-name: io.grpc:grpc-netty-shaded
  dependency-version: 1.75.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

end2end-test-examples/echo-client/pom.xml

@@ -19,7 +19,7 @@
   <properties>
     <maven.compiler.source>8</maven.compiler.source>
     <maven.compiler.target>8</maven.compiler.target>
-    <grpc.version>1.53.0</grpc.version>
+    <grpc.version>1.75.0</grpc.version>
     <protobuf.version>3.9.0</protobuf.version>
     <protoc.version>${protobuf.version}</protoc.version>
     <opencensus.version>0.31.0</opencensus.version>