Is there an existing issue for this?

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Describe the bug

app.static should specify UTF-8 for MIME types text/*. Currently it returns simply text/html for HTML files.

Code snippet

from sanic import Sanic

app = Sanic("index")
app.static("/", ".", index="index.html")

Expected Behavior

content-type: text/html; charset=UTF-8

How do you run Sanic?

Sanic CLI

Operating System

Linux

Sanic Version

24.6.0

Additional context

No response