Revert "Update Gradle and AGP to v8.0 (#283)" (#295)

This reverts commit cda0606a0d.

libraries/ui-strings/build.gradle.kts

@@ -18,8 +18,15 @@
 @Suppress("DSL_SCOPE_VIOLATION")
 plugins {
     id("io.element.android-library")
+    alias(libs.plugins.stemlibrary)
 }
 
 android {
     namespace = "io.element.android.libraries.ui.strings"
 }
+
+// forcing the stem string template generator to be cacheable, without this the templates
+// are regenerated causing the app module to recompile its sources
+tasks.withType(com.likethesalad.android.templates.common.tasks.BaseTask::class.java) {
+    outputs.cacheIf { true }
+}