Tests

Remove Nexus proxy when present. Add support for Poetry 2.0 #970

Job	Run time
pre-commit 3.10 / ubuntu-latest	20s
mypy 3.10 / ubuntu-latest	31s
mypy 3.11 / ubuntu-latest	16s
unit_tests 3.10 / ubuntu-latest	25s
unit_tests 3.11 / ubuntu-latest	19s
unit_tests 3.10 / windows-latest	1m 33s
unit_tests 3.10 / macos-latest	43s
integration_tests 3.10 / ubuntu-latest	17s
typeguard 3.10 / ubuntu-latest	23s
docs-build 3.10 / ubuntu-latest	17s
coverage	0s
	5m 4s

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