chore: update version code to 21 and version name to 1.5.1 (#158)

Author: duartebarbosadev

app/build.gradle.kts

@@ -56,8 +56,8 @@ android {
             libs.versions.targetSdk
                 .get()
                 .toInt()
-        versionCode = 20
-        versionName = "1.5.0"
+        versionCode = 21
+        versionName = "1.5.1"
         testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
     }