curl sample enhancements (#2332)

* Enable 'curl' in pre-commit tests
* Samples: Use Gradle plugin version 1.3.10

samples/build.gradle

@@ -36,6 +36,7 @@ task buildSamplesWithPlatformLibs() {
     dependsOn ':workers:assemble'
 
     if (MPPTools.isMacos() || MPPTools.isLinux()) {
+        dependsOn ':curl:assemble'
         dependsOn ':nonBlockingEchoServer:assemble'
         dependsOn ':tensorflow:assemble'
     }

samples/gradle.properties

@@ -2,7 +2,7 @@
 org.gradle.parallel=true
 
 # Pin Kotlin version:
-kotlin_version=1.3.0
+kotlin_version=1.3.10
 
 # Use custom Kotlin/Native home:
 org.jetbrains.kotlin.native.home=../../dist