Internal CI for Engine artifacts doesn't work

[HidenoriMatsubayashi]

Hi @taka-okayama

It looks like the internal CI for building and uploading Engine artifacts hasn't worked as version 3.13.8 and 3.13.9 are missing.
https://docs.flutter.dev/release/archive?tab=linux

Can you please check the CI and its scripts? Thanks.

[taka-okayama]

@HidenoriMatsubayashi thanks for your notification

I fixed this issue with internal CI and kicked it now. i would appreciate your patience.

Reason of CI failure:

• python3 version mismatch

[HidenoriMatsubayashi]

Thanks for the fix! Closing.