Function you can add to your profile for resetting a given branch in your fork to the upstream branch.

Reset-BranchToUpstream.ps1

function Reset-BranchToUpstream {
    <#
    .SYNOPSIS
        Command to reset the branch to your upstream remote
    .DESCRIPTION
        Assumes you remote is setup as origin is your fork, and "upstream" is the remote source. You can pass in a branch, and it assumes you have this branch checked out on your origin or local repository.
    .PARAMETER Branch
        The desired branch you want to sync
    .EXAMPLE
        Reset-BranchToUpstream -Branch development
        Reset my currently checked out branch to the upstream/development branch of my remote
    #>
    [cmdletbinding()]
    param([string]$Branch)
    if (Test-Path '.git') {
        if ( (git remote -v | Select-String "upstream") ) {
            $cmd = "git fetch upstream"
            Invoke-Expression $cmd

            $cmd = "git reset --hard upstream/$branch"
            Invoke-Expression $cmd

            $cmd = "git push origin $branch --force"
            Invoke-Expression $cmd
        } else {
            Write-Output "No upstream remote found"
        }
    } else {
        Write-Output "No git folder found"
    }
}