Revert AndroidX fragment to version 1.6.2

https://issuetracker.google.com/issues/341313071

app/build.gradle

@@ -545,7 +545,7 @@ dependencies {
     def emoji_version = "1.4.0" // 1.5.0-alpha01
     def flatbuffers_version = "2.0.0"
     def activity_version = " 1.9.0"
-    def fragment_version = "1.7.1" // 1.8.0-beta01
+    def fragment_version = "1.6.2" // 1.7.1 // 1.8.0-beta01
     def windows_version = "1.2.0" // 1.3.0-rc01
     def webkit_version = "1.10.0" // 1.11.0
     def recyclerview_version = "1.3.2" // 1.4.0-alpha01