Bug 1791878 - Update to kotlin 1.7.20 and gradle plugin 7.3.0. r=geckoview-reviewers,m_kato

Differential Revision: https://phabricator.services.mozilla.com/D175166

build.gradle

@@ -110,11 +110,11 @@ buildscript {
         }
     }
 
-    ext.kotlin_version = '1.6.21'
+    ext.kotlin_version = '1.7.20'
 
     dependencies {
         classpath 'org.mozilla.apilint:apilint:0.5.2'
-        classpath 'com.android.tools.build:gradle:7.2.2'
+        classpath 'com.android.tools.build:gradle:7.3.0'
         classpath 'org.apache.commons:commons-exec:1.3'
         classpath 'com.diffplug.spotless:spotless-plugin-gradle:6.12.1'
         classpath 'org.tomlj:tomlj:1.0.0'

mobile/android/annotations/build.gradle

@@ -2,9 +2,12 @@ buildDir "${topobjdir}/gradle/build/mobile/android/annotations"
 
 apply plugin: 'java'
 
+// lint should be X+23.Y.Z of gradle_plugin version, according to:
+// http://googlesamples.github.io/android-custom-lint-rules/api-guide.html#example:samplelintcheckgithubproject/lintversion?
+
 dependencies {
-    implementation 'com.android.tools.lint:lint:30.2.2'
-    implementation 'com.android.tools.lint:lint-checks:30.2.2'
+    implementation 'com.android.tools.lint:lint:30.3.0'
+    implementation 'com.android.tools.lint:lint-checks:30.3.0'
 }
 
 sourceCompatibility = JavaVersion.VERSION_11