set autorest.powershell v4 as default version loaded by autorest

[dolauli]

Change the default version of autorest.powershell loaded by autorest from 3.0+ to 4.0+.

[dolauli]

@timotheeguerin Could you please help review and merge my change? We had a similar update two years ago when we transitioned autorest.powershell from 2.1+ to 3.0+.

BTW, the CI failure seems not caused by my change.

[timotheeguerin]

Have a pr here that should solve the ci bug, #4794

but somehow I cannot merge PRs anymore in autorest. MIght have been due to the permission cleanup

[dolauli]

Have a pr here that should solve the ci bug, #4794

but somehow I cannot merge PRs anymore in autorest. MIght have been due to the permission cleanup

Hi Tim, Thanks a lot for helping review the PR. Do you know who may have the permission to merge the PR? Or I have to wait for you to re-apply the permission.

[timotheeguerin]

I got the permission back but the failure is still happening, now seems to be a problem with @autorest/python installing