fix(update_check): set encoding to 'utf-8' for subprocess.run in Upda…

…teWorker

src/core/widgets/yasb/update_check.py

@@ -52,6 +52,7 @@ def run(self):
                 result = subprocess.run(
                     ['winget', 'upgrade'],
                     capture_output=True,
+                    encoding='utf-8',
                     text=True,
                     check=True,
                     shell=True,