chore: Downgrade AGP version to allow F-Droid builds again

Author: nsh07

app/build.gradle.kts

@@ -19,8 +19,8 @@ android {
         applicationId = "org.nsh07.wikireader"
         minSdk = 26
         targetSdk = 36
-        versionCode = 48
-        versionName = "2.5.0"
+        versionCode = 49
+        versionName = "2.5.1"
 
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables {