fix(desktop): align vendored instance version (hoppscotch#5687)

This fixes the stale vendored display version.

 `VENDORED_INSTANCE_CONFIG` currently stores old instance version
 `25.9.0` and while other components do override this correctly, it'd be
 better to keep this consistent per release.

 Closes FE-1102

Author: CuriousCorrelation

packages/hoppscotch-common/src/platform/instance.ts

@@ -18,7 +18,7 @@ export const VENDORED_INSTANCE_CONFIG: Instance = {
   kind: "vendored" as const,
   serverUrl: "app://hoppscotch",
   displayName: "Hoppscotch Desktop",
-  version: "25.9.0",
+  version: "25.12.0",
   lastUsed: new Date().toISOString(),
   bundleName: "Hoppscotch",
 }