python: add Python 3.13 testing in CI (#6108) #1283

Job	Run time
Check Python types	3m 27s
Lint	1m 35s
Test Positron IPyKernel (macos-latest, 3.9)	1m 55s
Test Minimum Positron IPyKernel Dependencies (ubuntu-latest, 3.8)	4m 27s
Test Positron IPyKernel (windows-latest, 3.10)	9m 20s
Test Positron IPyKernel (ubuntu-latest, 3.11)	3m 2s
Python Tests (ubuntu-latest, 3.8)	1m 42s
Test Positron IPyKernel (ubuntu-latest, 3.12)	3m 1s
Python Tests (ubuntu-latest, 3.13)	1m 43s
Test Positron IPyKernel (ubuntu-latest, 3.13)	3m 56s
Test TypeScript (ubuntu-latest, 3.x, ts-unit)	3m 12s
Test TypeScript (ubuntu-latest, 3.x, functional)	2m 3s
Test TypeScript (macos-latest, 3.x, ts-unit)	2m 46s
Test TypeScript (macos-latest, 3.x, venv)	3m 19s
Test TypeScript (macos-latest, 3.x, single-workspace)	3m 26s
Test TypeScript (macos-latest, 3.x, debugger)	2m 26s
Test TypeScript (macos-latest, 3.x, functional)	1m 26s
Test TypeScript (macos-latest, 3.x, smoke)	3m 33s
Test TypeScript (windows-latest, 3.x, ts-unit)	4m 44s
Test TypeScript (windows-latest, 3.x, functional)	3m 56s
	1h 4m 59s

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