Auto update feature for PS6 doesn't support proxy

System Details

System Details Output

### VSCode version: 1.39.2 6ab598523be7a800d7f3eb4d92d7ab9a66069390 x64

### VSCode extensions:
aaron-bond.better-comments@2.0.5
cnojima.readable-indent@1.2.1
CoenraadS.bracket-pair-colorizer@1.0.61
DavidAnson.vscode-markdownlint@0.31.0
eamodio.gitlens@10.1.1
felipecaputo.git-project-manager@1.7.1
Gruntfuggly.todo-tree@0.0.160
humao.rest-client@0.22.2
ms-azure-devops.azure-pipelines@1.157.4
ms-azuretools.vscode-apimanagement@0.1.1
ms-azuretools.vscode-azureappservice@0.16.0
ms-azuretools.vscode-azurefunctions@0.19.0
ms-azuretools.vscode-azurestorage@0.7.2
ms-azuretools.vscode-cosmosdb@0.11.0
ms-azuretools.vscode-docker@0.8.1
ms-mssql.mssql@1.6.0
ms-vscode-remote.remote-wsl@0.39.9
ms-vscode.azure-account@0.8.6
ms-vscode.azurecli@0.4.6
ms-vscode.powershell@2019.9.0
ms-vscode.vscode-node-azure-pack@0.0.9
ms-vsts.team@1.149.2
msazurermtools.azurerm-vscode-tools@0.7.0
sdras.night-owl@1.1.3
Tyriar.theme-sapphire@0.9.1
vsciot-vscode.azure-iot-toolkit@2.11.0
vscode-icons-team.vscode-icons@9.4.0
waderyan.gitblame@3.0.1


### PSES version:

### PowerShell version:

Name                           Value
----                           -----
PSVersion                      6.2.3
PSEdition                      Core
GitCommitId                    6.2.3
OS                             Microsoft Windows 10.0.17763
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Issue Description

I am experiencing a problem with the auto update feature in PS extension for VSCode.

Expected Behaviour

If http.proxy and/or https.proxy is configured in any settings.json, the same proxy should be used with the Invoke-RestMethod -proxy

Actual Behaviour

Invoke-Restmethod with no -proxy will cause the auto update to fail as it can't download the installer.

Attached Logs

No logs, as I manually upgraded before saving them but you can clearly see what is happening in console that there is no -proxy etc.

Beginne damit, den Auto-Update-Pfad der Erweiterung und dessen Invoke-RestMethod-Aufruf zu finden, und prüfe anschließend, wie http.proxy und https.proxy aus settings.json bereitgestellt werden. Verifiziere, dass der Updater beim Herunterladen des Installers den konfigurierten Proxy verwendet, und bestätige, dass das Update in einer Umgebung mit Proxy erfolgreich ist.