chore: bump version to v2.8.3

Prepare the next release after refining Docker image rebuild triggers
for collector and frontend changes.

Author: leolionart

frontend/package.json

@@ -1,7 +1,7 @@
 {
     "name": "cliproxy-dashboard",
     "private": true,
-    "version": "2.8.2",
+    "version": "2.8.3",
     "type": "module",
     "scripts": {
         "dev": "vite",