fix(deps): update dependency io.grpc:grpc-kotlin-stub to v1.4.3

Author: renovate[bot]

.web/docs/developers/api/kotlin/build.gradle.kts

@@ -12,7 +12,7 @@ repositories {
 }
 
 val grpcVersion = "1.70.0"
-val grpcKotlinVersion = "1.4.1"
+val grpcKotlinVersion = "1.4.3"
 val connectVersion = "0.7.1"
 val protobufVersion = "4.29.3"