Tests

ci: use modded setup-python #448

Job	Run time
Build Web UI / Build Treemap WebUI	29s
Tests (ubuntu-latest, unit)	1m 11s
Tests (ubuntu-latest, integration-example)	2m 16s
Tests (ubuntu-latest, integration-real)	5m 23s
Tests (windows-latest, unit)	5m 22s
Tests (windows-latest, integration-example)	6m 56s
Tests (windows-latest, integration-real)	8m 44s
Tests (macos-13, unit)	1m 38s
Tests (macos-13, integration-example)	3m 25s
Tests (macos-13, integration-real)	9m 16s
Tests (macos-14, unit)	2m 2s
Tests (macos-14, integration-example)	3m 39s
Tests (macos-14, integration-real)	13m 42s
Merge results (ubuntu-latest)	1m 58s
Merge results (windows-latest)	2m 4s
Merge results (macos-13)	2m 10s
Merge results (macos-14)	1m 59s
	1h 12m 14s

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