android: Update Android Gradle Plugin to 7.2.1

Release notes [1]:

> 7.2.1 (May 2022)
>
>     This minor update corresponds to the release of Android Studio
>     Chipmunk Patch 1 and includes the following bug fixes:
>
>     bundletool does not package baseline profiles correctly [2]
>
>     To see the other bug fixes included in this release, see the Android
>     Studio Chipmunk Patch 1 release notes. [3]

[1] https://developer.android.com/studio/releases/gradle-plugin?buildsystem=ndk-build#7-2-0
[2] https://issuetracker.google.com/issues/230361284
[3] https://developer.android.com/studio/releases#patch-releases

Change-Id: I57f37ea3786003dba4d95b291ddf6b0b44dccaa4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/135053
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

android/source/build.gradle

@@ -15,7 +15,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.2.0'
+        classpath 'com.android.tools.build:gradle:7.2.1'
     }
 }