Chore: rename flavor 'open' to 'foss'

hideapi/build.gradle.kts

@@ -18,7 +18,10 @@ android {
     buildTypes {
         named("release") {
             isMinifyEnabled = false
-            proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
         }
     }
 }