doc: replace dead link to flask subclassing page (#1031)

dynaconf · Dec 11, 2023 · 708d842 · 708d842
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diff --git a/docs/flask.md b/docs/flask.md
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 Dynaconf provides a drop in replacement for `app.config`.
 
-As Flask encourages the composition by overriding the `config_class` attribute this extension follows the [patterns of Flask](http://flask.pocoo.org/docs/0.12/patterns/subclassing/) and turns your Flask's `app.config` in to a `dynaconf` instance.
+As Flask encourages the composition by overriding the `config_class` attribute this extension follows the [patterns of Flask](https://flask.palletsprojects.com/en/2.3.x/patterns/subclassing/) and turns your Flask's `app.config` in to a `dynaconf` instance.
 
 ## Initialize the extension