chore: add changeset for beta release CI check (#265)

Author: Seungwoo321

.changeset/beta-release-changeset.md

@@ -0,0 +1,9 @@
+---
+"vue-pivottable": patch
+"@vue-pivottable/lazy-table-renderer": patch
+"@vue-pivottable/plotly-renderer": patch
+---
+
+chore: 베타 릴리즈를 위한 changeset 추가
+
+- PR #264 CI 체크 통과를 위한 changeset