Simplify (request.cookies.)getlist function #48

Job	Run time
Linux / Python 3.8 / tox -e security	34s
Linux / Python 3.9 / tox -e security	5s
Linux / Python 3.10 / tox -e security	37s
Linux / Python 3.11 / tox -e security	39s
Linux / Python 3.10 / tox -e lint	49s
Linux / Python 3.8 / tox -e type-checking	49s
Linux / Python 3.9 / tox -e type-checking	1s
Linux / Python 3.10 / tox -e type-checking	49s
Linux / Python 3.11 / tox -e type-checking	46s
Linux / Python 3.8 / tox -e py38	48s
Linux / Python 3.8 / tox -e py38-no-ext	48s
Linux / Python 3.9 / tox -e py39	47s
Linux / Python 3.9 / tox -e py39-no-ext	8s
Linux / Python 3.10 / tox -e py310	50s
Linux / Python 3.10 / tox -e py310-no-ext	51s
Linux / Python 3.11 / tox -e py311	48s
Linux / Python 3.11 / tox -e py311-no-ext	50s
Windows / Python 3.8 / tox -e py38-no-ext	49s
Windows / Python 3.9 / tox -e py39-no-ext	46s
Windows / Python 3.10 / tox -e py310-no-ext	48s
Windows / Python 3.11 / tox -e py310-no-ext	53s
	14m 15s

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