Remove last flask occurance from setup.py

fixes #4390

setup.py

@@ -19,7 +19,7 @@ if readme_file.is_file():
     readme_long = (Path(__file__).parent / "README.md").read_text()
 
 # Requirements used for submodules
-api = ['flask', 'flask-jwt-extended', 'flask-cors']
+api = ['fastapi', 'uvicorn', 'pyjwt', 'aiofiles']
 plot = ['plotly>=4.0']
 hyperopt = [
     'scipy',

tests/rpc/test_rpc_apiserver.py

@@ -295,7 +295,7 @@ def test_api_run(default_conf, mocker, caplog):
                    "Please make sure that this is intentional!", caplog)
     assert log_has_re("SECURITY WARNING - `jwt_secret_key` seems to be default.*", caplog)
 
-    # Test crashing flask
+    # Test crashing API server
     caplog.clear()
     mocker.patch('freqtrade.rpc.api_server.webserver.UvicornServer',
                  MagicMock(side_effect=Exception))