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

This reverts commit cda0606a0d.

app/build.gradle.kts

@@ -25,6 +25,7 @@ import extension.allServicesImpl
 @Suppress("DSL_SCOPE_VIOLATION")
 plugins {
     id("io.element.android-compose-application")
+    alias(libs.plugins.stem)
     alias(libs.plugins.kotlin.android)
     alias(libs.plugins.anvil)
     alias(libs.plugins.ksp)
@@ -139,7 +140,7 @@ android {
         }
     }
     kotlinOptions {
-        jvmTarget = "17"
+        jvmTarget = "1.8"
     }
 
     // Waiting for https://github.com/google/ksp/issues/37
@@ -150,10 +151,6 @@ android {
             }
         }
     }
-
-    buildFeatures {
-        buildConfig = true
-    }
 }
 
 androidComponents {