Upgrade AGP and Gradle

If anybody has a problem with missing or mismatched NDK, run this command to install the right version

$ANDROID_SDK_ROOT/tools/bin/sdkmanager 'ndk;20.0.5594570'

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

build.gradle

@@ -7,7 +7,7 @@ allprojects {
 
 buildscript {
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.5.3'
+        classpath 'com.android.tools.build:gradle:3.6.0'
         classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.61'
     }
     repositories {
@@ -22,7 +22,7 @@ task clean(type: Delete) {
 
 tasks {
     wrapper {
-        gradleVersion = "6.1.1"
+        gradleVersion = "6.2.1"
         distributionType = Wrapper.DistributionType.ALL
     }
 }