python/ci: adjust CI testing for python 3.8 #1167

Job	Run time
Lint	1m 38s
Test Positron IPyKernel (macos-latest, 3.9)	31s
Check Python types	56s
Test Positron IPyKernel (windows-latest, 3.10)	27s
Test Minimum Positron IPyKernel Dependencies (ubuntu-latest, 3.8)	1m 14s
Python Tests (ubuntu-latest, 3.8)	1m 44s
Test Positron IPyKernel (ubuntu-latest, 3.11)	29s
Python Tests (ubuntu-latest, 3.13)	1m 47s
Test Positron IPyKernel (ubuntu-latest, 3.12)	29s
Test TypeScript (ubuntu-latest, 3.x, ts-unit)	2m 50s
Test Positron IPyKernel (ubuntu-latest, 3.13)	36s
Test TypeScript (ubuntu-latest, 3.x, functional)	1m 49s
Test TypeScript (macos-latest, 3.x, ts-unit)	2m 45s
Test TypeScript (macos-latest, 3.x, venv)	3m 20s
Test TypeScript (macos-latest, 3.x, single-workspace)	3m 2s
Test TypeScript (macos-latest, 3.x, debugger)	3m 0s
Test TypeScript (macos-latest, 3.x, functional)	1m 49s
Test TypeScript (macos-latest, 3.x, smoke)	2m 51s
Test TypeScript (windows-latest, 3.x, ts-unit)	6m 24s
Test TypeScript (windows-latest, 3.x, functional)	5m 15s
	42m 56s

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