Create/Update assets for version 1.21-pre1

assets/minecraft/textures/gui/sprites/social_interactions/_list.json

@@ -0,0 +1 @@
+{"directories":[],"files":["background.png","background.png.mcmeta","mute_button.png","mute_button_highlighted.png","report_button.png","report_button_disabled.png","report_button_highlighted.png","unmute_button.png","unmute_button_highlighted.png"]}

assets/minecraft/textures/gui/sprites/social_interactions/background.png.mcmeta

@@ -0,0 +1,10 @@
+{
+    "gui": {
+        "scaling": {
+            "type": "nine_slice",
+            "width": 236,
+            "height": 34,
+            "border": 8
+        }
+    }
+}