python/ci: adjust CI testing for python 3.8 #1164

Job	Run time
Check Python types	2m 56s
Lint	1m 48s
Python Tests (ubuntu-latest, 3.8)	1m 44s
Python Tests (ubuntu-latest, 3.13)	1m 47s
Test Positron IPyKernel (macos-latest, 3.9)	41s
Test Positron IPyKernel (windows-latest, 3.10)	39s
Test Positron IPyKernel (ubuntu-latest, 3.11)	54s
Test Positron IPyKernel (ubuntu-latest, 3.12)	54s
Test Positron IPyKernel (ubuntu-latest, 3.13)	36s
Test Minimum Positron IPyKernel Dependencies (ubuntu-latest, 3.8)	3m 8s
Test TypeScript (ubuntu-latest, 3.x, ts-unit)	2m 51s
Test TypeScript (ubuntu-latest, 3.x, functional)	1m 47s
Test TypeScript (macos-latest, 3.x, ts-unit)	2m 40s
Test TypeScript (macos-latest, 3.x, venv)	3m 11s
Test TypeScript (macos-latest, 3.x, single-workspace)	3m 12s
Test TypeScript (macos-latest, 3.x, debugger)	2m 17s
Test TypeScript (macos-latest, 3.x, functional)	1m 52s
Test TypeScript (macos-latest, 3.x, smoke)	3m 3s
Test TypeScript (windows-latest, 3.x, ts-unit)	5m 5s
Test TypeScript (windows-latest, 3.x, functional)	5m 54s
	46m 59s

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