feat!: bump Gradle 7.6 & AGP 7.4.2 (#1539)

* feat: bump gradle 7.6
* feat: bump android gradle plugin 7.3.1
* feat: bump android gradle plugin 7.4.2
* fix!: move android package name to build.gradle namespace
* fix!: remove deprecated package name from AndroidManifest
* fix: package name
* fix: rename CordovaGradleConfigParser's _save to write
* test: fix CordovaGradleConfigParser related specs
* fix: test refactoring for gradle namespace
* fix: accidental variable naming mixing

---------

Co-authored-by: Norman Breau <norman@nbsolutions.ca>

templates/project/AndroidManifest.xml

@@ -18,7 +18,9 @@
        under the License.
 -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-  package="__PACKAGE__" android:versionName="1.0" android:versionCode="1" android:hardwareAccelerated="true">
+    android:versionName="1.0"
+    android:versionCode="1"
+    android:hardwareAccelerated="true">
     <supports-screens
         android:largeScreens="true"
         android:normalScreens="true"

templates/project/app/build.gradle

@@ -179,9 +179,11 @@ task cdvPrintProps {
 }
 
 android {
+    namespace cordovaConfig.PACKAGE_NAMESPACE
+
     defaultConfig {
         versionCode cdvVersionCode ?: new BigInteger("" + privateHelpers.extractIntFromManifest("versionCode"))
-        applicationId privateHelpers.extractStringFromManifest("package")
+        applicationId cordovaConfig.PACKAGE_NAMESPACE
 
         minSdkVersion cordovaConfig.MIN_SDK_VERSION
         if (cordovaConfig.MAX_SDK_VERSION != null) {