Bump com.google.protobuf:protobuf-kotlin in /examples (#483)

Bumps com.google.protobuf:protobuf-kotlin from 3.24.1 to 3.25.1.

---
updated-dependencies:
- dependency-name: com.google.protobuf:protobuf-kotlin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

examples/gradle/libs.versions.toml

@@ -19,7 +19,7 @@ grpc-stub = { group = "io.grpc", name = "grpc-stub", version = "1.60.0" }
 grpc-kotlin-stub = { group = "io.grpc", name = "grpc-kotlin-stub", version = "1.4.1" }
 
 protoc = { group = "com.google.protobuf", name = "protoc", version = "3.25.1" }
-protobuf-kotlin = { group = "com.google.protobuf", name = "protobuf-kotlin", version = "3.24.1" }
+protobuf-kotlin = { group = "com.google.protobuf", name = "protobuf-kotlin", version = "3.25.1" }
 protobuf-kotlin-lite = { group = "com.google.protobuf", name = "protobuf-kotlin-lite", version = "3.25.1" }
 protobuf-java-util = { group = "com.google.protobuf", name = "protobuf-java-util", version = "3.25.1" }
 protoc-gen-grpc-java = { group = "io.grpc", name = "protoc-gen-grpc-java", version = "1.60.0" }