Bump kotlin-gradle-plugin from 1.3.72 to 1.4.0 (#1882)

Bumps kotlin-gradle-plugin from 1.3.72 to 1.4.0.

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

build.gradle

@@ -15,7 +15,7 @@
 import com.google.firebase.gradle.plugins.license.LicenseResolverPlugin
 
 buildscript {
-    ext.kotlinVersion = '1.3.72'
+    ext.kotlinVersion = '1.4.0'
     repositories {
         google()
         jcenter()