chore: bump version to v2.13.1

- Updated package.json version from 2.13.0 to 2.13.1
- Added CHANGELOG.md entry for v2.13.1 with Docker workflow improvements
- Includes Docker Scout migration, CI/CD enhancements, and package updates

package.json

@@ -1,7 +1,7 @@
 {
   "name": "gitea-mirror",
   "type": "module",
-  "version": "2.13.0",
+  "version": "2.13.1",
   "engines": {
     "bun": ">=1.2.9"
   },