[BUG] when provided pfx and passwd, it still require to confirm the certificate install

[Mon-ius]

Inside github action, when run

dart run msix:create -c "signingCert.pfx" -p ${{ secrets.WINDOWS_PFX_PASSWD }}

it returns the error that,

Run dart run msix:create -c "signingCert.pfx" -p ***
running "flutter build windows"...      �/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�16.6s
building msix files...                  �/�-�\�|�/�-�0.4s
packing msix files...                   �/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/�-�\�|�/� 

Unhandled exception:
type 'Null' is not a subtype of type 'FutureOr<String>'
#0      _AsyncCompleter.complete (dart:async/future_impl.dart:85:41)
#1      Prompter.prompt.<anonymous closure>.<anonymous closure> (package:console/src/prompt.dart:222:19)
#2      new Future.<anonymous closure> (dart:async/future.dart:258:40)
#3      Timer._createTimer.<anonymous closure> (dart:async-patch/timer_patch.dart:18:15)
#4      _Timer._runTimers (dart:isolate-patch/timer_impl.dart:398:19)
#5      _Timer._handleMessage (dart:isolate-patch/timer_impl.dart:429:5)
#6      _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:184:[12](https://github.com/LaoWangFantasy/click/actions/runs/12335929689/job/34427918336#step:11:13))
Do you want to install the certificate: "signingCert.pfx" ? (y/N) 
Error: Process completed with exit code 1.

However, as described inside the doc,

Note: By default, the MSIX package will install the certificate on your machine.

It should be fixed to not prompt such message for confirmations.