release: switch to beta releases

Author: fu050409

.changes/pre.json

@@ -1,5 +1,5 @@
 {
-  "tag": "alpha",
+  "tag": "beta",
   "changes": [
     ".changes/add-inputcount-component.md",
     ".changes/add-list-component.md",
@@ -13,7 +13,6 @@
     ".changes/optimize-callback.md",
     ".changes/optimize-sender-button.md",
     ".changes/optimize-sender-input.md",
-    ".changes/optimize-usechat.md",
-    ".changes/release-alpha.md"
+    ".changes/optimize-usechat.md"
   ]
 }