gradle: hello_xr: Bump AGP to 7.4.2

Looks like 7.4.2 fixes the cmake integration problem.
Signed-off-by: utzcoz <utzcoz@outlook.com>

Author: utzcoz

src/tests/hello_xr/build.gradle

@@ -10,7 +10,7 @@ buildscript {
         mavenCentral()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:7.0.4'
+        classpath 'com.android.tools.build:gradle:7.4.2'
     }
 }
 

src/tests/hello_xr/gradle/wrapper/gradle-wrapper.jar

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists