providers/oauth2: revert PKCE requirement for public clients

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

authentik/providers/oauth2/views/authorize.py

@@ -260,9 +260,6 @@ class OAuthAuthorizationParams:
                 self.state,
                 f"Unsupported challenge method {self.code_challenge_method}",
             )
-        if self.provider.client_type == ClientTypes.PUBLIC and not self.code_challenge:
-            LOGGER.warning("Public clients require PKCE", client_id=self.provider.client_id)
-            raise AuthorizeError(self.redirect_uri, "invalid_request", self.grant_type, self.state)
 
     def create_code(self, request: HttpRequest) -> AuthorizationCode:
         """Create an AuthorizationCode object for the request"""