android: Update Android Gradle Plugin to 9.3.1

... and gradle to 9.1.0, as suggested by
Android Studio.

Update done via the update assistant in Android Studio,
which also automatically sets some compatibility settings.
Whether all of these are necessary or some can be removed
might be worth investigating later, but leave all of them
in place initially.

Update is possible now that the issue previously
blocking the update as mentioned in

    commit 061027555c
    Author: Michael Weghorn <m.weghorn@posteo.de>
    Date:   Thu Feb 19 12:40:27 2026 +0100

        android: Update Android Gradle Plugin to 8.13.2

is taken care of by previous commit

    Change-Id: I5d6bbe844845f62f09458a6365142ddc374b00f8
    Author: Michael Weghorn <m.weghorn@posteo.de>
    Date:   Thu Mar 26 07:36:50 2026 +0100

        android: Use gradle file helper

This update also implies that OpenJDK 25 (the current
OpenJDK LTS release) is supported now, see [1].

[1] https://docs.gradle.org/current/userguide/compatibility.html

Change-Id: I86345b625777d81a666a1f2abb3bfb44030bed35
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/202699
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

android/gradle.properties

@@ -1,5 +1,15 @@
+android.builtInKotlin=false
+android.defaults.buildfeatures.resvalues=true
+android.dependency.useConstraints=true
+android.enableAppCompileTimeRClass=false
+android.newDsl=false
 android.nonFinalResIds=false
 android.nonTransitiveRClass=false
+android.r8.optimizedResourceShrinking=false
+android.r8.strictFullModeForKeepRules=false
+android.sdk.defaultTargetSdkToCompileSdkIfUnset=false
+android.uniquePackageNames=false
 android.useAndroidX=true
+android.usesSdkInManifest.disallowed=false
 org.gradle.jvmargs=-Xmx3072m
 org.gradle.warning.mode=all

android/gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 constraintlayout_version = "2.2.1"
-gradle_version = "8.13.2"
+gradle_version = "9.1.0"
 material_version = "1.13.0"
 preference_version = "1.2.1"
 

android/gradle/wrapper/gradle-wrapper.properties

@@ -1,7 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionSha256Sum=fba8464465835e74f7270bbf43d6d8a8d7709ab0a43ce1aa3323f73e9aa0c612
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-all.zip
+distributionSha256Sum=17f277867f6914d61b1aa02efab1ba7bb439ad652ca485cd8ca6842fccec6e43
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.3.1-all.zip
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists