Downgrade AGP to 8.1.4 (fixes bitfireAT/davx5-ose#511)

app/proguard-rules-release.pro

@@ -2,6 +2,7 @@
 # R8 usage for DAVx⁵:
 #    shrinking        yes (only in release builds)
 #    optimization     yes (on by R8 defaults)
+#      full-mode      no (see gradle.properties)
 #    obfuscation      no (open-source)
 
 -dontobfuscate

build.gradle

@@ -34,7 +34,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:8.2.0'
+        classpath 'com.android.tools.build:gradle:8.1.4'    // 8.2.0 seems to be broken, see https://github.com/bitfireAT/davx5-ose/issues/511
         classpath "com.google.dagger:hilt-android-gradle-plugin:${versions.hilt}"
         classpath "com.mikepenz.aboutlibraries.plugin:aboutlibraries-plugin:${versions.aboutLibraries}"
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:${versions.kotlin}"