UTF-8 Check fails on windows in Powershell

[Gizmokid2005]

Description

The current version of sopel in pip (py3.9.6) and from git master both prompt this message upon running sopel even with a utf8 configuration:

WARNING!!! You are running with a non-UTF8 locale environment variable (e.g. LC_ALL is set to "C"), which makes Python 3 do stupid things. If you get strange errors, please set it to something like "en_US.UTF-8".

Despite having a "English_United States", "utf8" locale from python.

Reproduction steps

Pull into a fresh python dev environment on windows 10.
Install sopel via pip or from source.
Run sopel.

Expected behavior

To not get a warning about UTF-8 since it's configured.

Logs

(.venv) PS C:\Users\Michael\Documents\Visual Studio Projects\Python\sopel> $PSVersionTable     

Name                           Value
----                           -----
PSVersion                      7.1.4
PSEdition                      Core
GitCommitId                    7.1.4
OS                             Microsoft Windows 10.0.19041
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

(.venv) PS C:\Users\Michael\Documents\Visual Studio Projects\Python\sopel> Get-WinSystemLocale 

LCID             Name             DisplayName
----             ----             -----------
1033             en-US            English (United States)

(.venv) PS C:\Users\Michael\Documents\Visual Studio Projects\Python\sopel> echo $OutputEncoding

Preamble          :      
BodyName          : utf-8
EncodingName      : Unicode (UTF-8)
HeaderName        : utf-8
WebName           : utf-8
WindowsCodePage   : 1200
IsBrowserDisplay  : True
IsBrowserSave     : True
IsMailNewsDisplay : True
IsMailNewsSave    : True
IsSingleByte      : False
EncoderFallback   : System.Text.EncoderReplacementFallback
DecoderFallback   : System.Text.DecoderReplacementFallback
IsReadOnly        : True
CodePage          : 65001


(.venv) PS C:\Users\Michael\Documents\Visual Studio Projects\Python\sopel> py
Python 3.9.6 (tags/v3.9.6:db3ff76, Jun 28 2021, 15:26:21) [MSC v.1929 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import locale
>>> locale.getlocale()
('English_United States', 'utf8')
>>> exit()

Environment

• Sopel .version: 8.0.0
• Sopel installed via: pip && source
• Python version: 3.9.6
• Operating system: Windows 10
• IRCd /version: N/A
• Relevant plugins: N/A