Can't upgrade in WSL2: UNC paths are not supported.

**Related command**

```
❯ az version
{
"azure-cli": "2.35.0",
"azure-cli-core": "2.35.0",
"azure-cli-telemetry": "1.0.6",
"extensions": {}
}

❯ az upgrade
This command is in preview and under development. Reference and support levels: https://aka.ms/CLI_refstatus
Your current Azure CLI version is 2.35.0. Latest version available is 2.37.0.
Please check the release notes first: https://docs.microsoft.com/cli/azure/release-notes-azure-cli
Do you want to continue? (Y/n): y
Not able to upgrade automatically. Instructions can be found at https://aka.ms/doc/InstallAzureCli
'\\wsl$\Ubuntu\home\magodo\github\terraform-provider-azurerm'
CMD.EXE was started with the above path as the current directory.
UNC paths are not supported. Defaulting to Windows directory.
CLI upgrade failed or aborted.
```

**Additional context**

I'm running this under WSL2, Ubuntu distribution:

```
❯ cat /etc/os-release
NAME="Ubuntu"
VERSION="20.04.4 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.4 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal
```