python/ci: adjust CI testing for python 3.8 #1165

Job	Run time
Python Tests (ubuntu-latest, 3.8)	1m 43s
Python Tests (ubuntu-latest, 3.13)	1m 50s
Check Python types	3m 0s
Lint	1m 34s
Test Positron IPyKernel (macos-latest, 3.9)	1m 24s
Test Minimum Positron IPyKernel Dependencies (ubuntu-latest, 3.8)	3m 32s
Test Positron IPyKernel (windows-latest, 3.10)	1m 10s
Test TypeScript (ubuntu-latest, 3.x, ts-unit)	2m 59s
Test Positron IPyKernel (ubuntu-latest, 3.11)	1m 27s
Test TypeScript (ubuntu-latest, 3.x, functional)	1m 45s
Test Positron IPyKernel (ubuntu-latest, 3.12)	1m 27s
Test TypeScript (macos-latest, 3.x, ts-unit)	2m 43s
Test Positron IPyKernel (ubuntu-latest, 3.13)	1m 13s
Test TypeScript (macos-latest, 3.x, venv)	2m 58s
Test TypeScript (macos-latest, 3.x, single-workspace)	3m 50s
Test TypeScript (macos-latest, 3.x, debugger)	2m 16s
Test TypeScript (macos-latest, 3.x, functional)	1m 33s
Test TypeScript (macos-latest, 3.x, smoke)	3m 54s
Test TypeScript (windows-latest, 3.x, ts-unit)	6m 21s
Test TypeScript (windows-latest, 3.x, functional)	5m 13s
	51m 52s

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