Update lowest supported Fedora to 35 #142

Job	Run time
lowest_environment_checks (pylint python3-hypothesis python3-hs-dbus-signature, PYTHONPATH=./src ...	1m 1s
lowest_environment_checks (python3-hypothesis python3-hs-dbus-signature, PYTHONPATH=./src make -f...	49s
development_environment_checks (black python3-isort, make -f Makefile fmt-travis)	22s
lowest_environment_checks (python3-setuptools, make legacy-package)	51s
development_environment_checks (yamllint, make -f Makefile yamllint)	19s
development_environment_checks (pylint python3-hypothesis, PYTHONPATH=./src:/github/home/.local/l...	26s
development_environment_checks (python3-hypothesis, PYTHONPATH=./src make -f Makefile test)	19s
development_environment_checks (python3-coverage python3-hypothesis, PYTHONPATH=./src make -f Mak...	31s
	4m 38s

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