Bump minimum Python to 3.11, update linting, drop dead branches #4337

Job	Run time
test_docs	54s
Make SDist	25s
build (ubuntu-latest, qt5, pypy-3.11)	3m 6s
link_check	2m 3s
build (macos-latest, qt6, 3.13)	3m 17s
build (macos-latest, qt5, pypy-3.11)	3m 56s
build (ubuntu-latest, qt6, pypy-3.11)	3m 10s
build (windows-latest, qt5, pypy-3.11)	4m 3s
build (ubuntu-latest, qt5, 3.14)	2m 38s
check_release	2m 2s
Test Minimum Versions	2m 56s
Test Prereleases	2m 34s
build (windows-latest, qt6, pypy-3.11)	4m 2s
build (windows-latest, qt6, 3.13)	3m 40s
build (macos-latest, qt5, 3.14)	3m 13s
build (macos-latest, qt6, pypy-3.11)	3m 54s
Test Lint	47s
build (ubuntu-latest, qt6, 3.12)	2m 57s
build (windows-latest, qt6, 3.11)	3m 46s
build (ubuntu-latest, qt6, 3.11)	2m 31s
build (windows-latest, qt5, 3.14)	3m 37s
build (macos-latest, qt6, 3.12)	3m 12s
build (ubuntu-latest, qt6, 3.13)	2m 31s
build (windows-latest, qt6, 3.12)	3m 47s
test_without_debugpy (ubuntu-latest, 3.11)	2m 2s
build (macos-latest, qt6, 3.11)	3m 20s
Install from SDist and Test	2m 26s
coverage	1s
	1h 16m 50s

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