fix(cli): decode cua-driver autostart PowerShell output as UTF-8

Widen of the PowerShell codepage cluster: the autostart registration
subprocess in tools_config.py was the last text=True capture in these
modules still decoding with the locale code page. Standardize on
encoding='utf-8', errors='replace' like the rest of the file (#53428).

hermes_cli/tools_config.py

@@ -1341,6 +1341,8 @@ def _repair_cua_driver_autostart_windows(driver_cmd: str, *, verbose: bool) -> b
             [ps, "-NoProfile", "-ExecutionPolicy", "Bypass", "-Command", ps_cmd],
             capture_output=True,
             text=True,
+            encoding="utf-8",
+            errors="replace",
             timeout=300,
             env=_cua_driver_env(),
         )