Bump to Python 3.9, Big typing updates #3721

60995 passed, 0 failed and 3112 skipped

Report	Passed	Skipped	Time
3.10-macos-latest-pytest-junit.xml	7617✅	390⚪	89s
3.10-ubuntu-latest-pytest-junit.xml	7617✅	390⚪	121s
3.10-windows-latest-pytest-junit.xml	7605✅	392⚪	153s
3.11-macos-latest-pytest-junit.xml	7617✅	390⚪	91s
3.12-macos-latest-pytest-junit.xml	7617✅	390⚪	103s
3.12-ubuntu-latest-pytest-junit.xml	7617✅	390⚪	174s
3.9-macos-latest-pytest-junit.xml	7617✅	390⚪	94s
3.9-ubuntu-latest-min-pytest-junit.xml	7688✅	380⚪	157s

8007 tests were completed in 89s with 7617 passed, 0 failed and 390 skipped.

Test suite	Passed	Failed	Skipped	Time
pytest	7617✅		390⚪	89s

8007 tests were completed in 121s with 7617 passed, 0 failed and 390 skipped.

Test suite	Passed	Failed	Skipped	Time
pytest	7617✅		390⚪	121s

7997 tests were completed in 153s with 7605 passed, 0 failed and 392 skipped.

Test suite	Passed	Failed	Skipped	Time
pytest	7605✅		392⚪	153s

8007 tests were completed in 91s with 7617 passed, 0 failed and 390 skipped.

Test suite	Passed	Failed	Skipped	Time
pytest	7617✅		390⚪	91s

8007 tests were completed in 103s with 7617 passed, 0 failed and 390 skipped.

Test suite	Passed	Failed	Skipped	Time
pytest	7617✅		390⚪	103s

8007 tests were completed in 174s with 7617 passed, 0 failed and 390 skipped.

Test suite	Passed	Failed	Skipped	Time
pytest	7617✅		390⚪	174s

8007 tests were completed in 94s with 7617 passed, 0 failed and 390 skipped.

Test suite	Passed	Failed	Skipped	Time
pytest	7617✅		390⚪	94s

8068 tests were completed in 157s with 7688 passed, 0 failed and 380 skipped.

Test suite	Passed	Failed	Skipped	Time
pytest	7688✅		380⚪	157s