Update FileManager sample's gradle

This commit updates the Gradle version of the FileManager sample.

- Updates the Gradle version to 7.5.
- Updates the AGP version to 7.4.2.
- Updates the Kotlin version to 1.6.21.
- Sets the namespace in the module build file.

Author: cartland

FileManager/app/build.gradle

@@ -54,6 +54,7 @@ android {
     kotlinOptions {
         jvmTarget = "1.8"
     }
+    namespace 'com.android.samples.filemanager'
 
 }
 

FileManager/app/src/main/AndroidManifest.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.android.samples.filemanager">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <uses-permission
         android:name="android.permission.MANAGE_EXTERNAL_STORAGE"

FileManager/build.gradle

@@ -17,13 +17,13 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.3.61'
+    ext.kotlin_version = '1.6.21'
     repositories {
         google()
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.0.1'
+        classpath 'com.android.tools.build:gradle:7.4.2'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong

FileManager/gradle/wrapper/gradle-wrapper.properties

@@ -19,4 +19,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-all.zip