Revert "gst-examples: update to gradle 8.3"

This reverts commit 06f5d15549.

Seems to break cerbero android examples ci.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/7799>

subprojects/gst-examples/playback/player/android/app/build.gradle

@@ -2,7 +2,6 @@ apply plugin: 'com.android.application'
 
 android {
     compileSdkVersion 32
-    namespace "org.freedesktop.gstreamer.play"
 
     defaultConfig {
         applicationId "org.freedesktop.gstreamer.play"

subprojects/gst-examples/playback/player/android/build.gradle

@@ -6,7 +6,7 @@ buildscript {
         google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:8.3.0'
+        classpath 'com.android.tools.build:gradle:7.1.0'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files

subprojects/gst-examples/playback/player/android/gradle/wrapper/gradle-wrapper.properties

@@ -3,4 +3,4 @@ distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.3.3-all.zip