tests

chore: enable mypy strict #428

Job	Run time
py unit tests	13s
py3.13 unit tests	12s
py3.11 unit tests	10s
py3.10 unit tests	13s
minimum dependency versions	13s
style	35s
py3.12 unit tests	12s
doc	16s
py3.9 unit tests	13s
py3.13 scim2-server downstream unit tests	18s
py3.13 scim2-tester downstream unit tests	18s
py3.13 scim2-cli downstream unit tests	16s
py3.11 scim2-cli downstream unit tests	18s
py3.12 scim2-cli downstream unit tests	20s
py3.12 scim2-client downstream unit tests	15s
py3.11 scim2-tester downstream unit tests	20s
py3.11 scim2-client downstream unit tests	16s
py3.11 scim2-server downstream unit tests	19s
py3.13 scim2-client downstream unit tests	18s
py3.12 scim2-tester downstream unit tests	21s
py3.12 scim2-server downstream unit tests	16s
	5m 52s

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