chore: update versions to stable

- Remove beta suffixes
- Update CHANGELOG.md files
- Prepare for production release

Author: github-actions[bot]

package.json

@@ -1,6 +1,6 @@
 {
   "name": "vue-pivottable",
-  "version": "1.2.1-beta.1755016316",
+  "version": "1.2.1",
   "type": "module",
   "description": "",
   "exports": {