build: update Kotlin

Change-Id: I5f062808bdcc887008db109e19bbc4e8faa060df

ring-android/build.gradle

@@ -4,10 +4,10 @@ buildscript {
         maven { url "https://maven.google.com" }
         mavenCentral()
     }
-    ext.kotlin_version = '1.5.30'
+    ext.kotlin_version = '1.5.31'
     ext.hilt_version = '2.38.1'
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.0.2'
+        classpath 'com.android.tools.build:gradle:7.0.3'
         classpath 'com.google.gms:google-services:4.3.10'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "com.google.dagger:hilt-android-gradle-plugin:$hilt_version"