Update version code to 8 and add new release file for version 4.0.8

app/build.gradle.kts

@@ -14,7 +14,7 @@ android {
         applicationId = "com.codeskraps.sbrowser_new"
         minSdk = 26
         targetSdk = 35
-        versionCode = 7
+        versionCode = 8
         versionName = "4.0"
         setProperty("archivesBaseName", "sBrowser-v$versionName.$versionCode")