test: bound `serve_in_thread` teardown to prevent CI hangs #595

Job	Run time
PR title check	6s
Code checks / Actions lint check	33s
Doc checks / Doc checks / Docs check	1m 43s
Code checks / Lint check / Lint check (3.12)	36s
Code checks / Lint check / Lint check (3.11)	32s
Code checks / Spell check	8s
Code checks / Lint check / Lint check (3.13)	33s
Code checks / Lint check / Lint check (3.10)	30s
Code checks / Type check / Type check (3.13)	33s
Code checks / Lint check / Lint check (3.14)	31s
Code checks / Type check / Type check (3.14)	32s
Code checks / Type check / Type check (3.12)	34s
Code checks / Type check / Type check (3.10)	34s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	6m 22s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	5m 7s
Code checks / Type check / Type check (3.11)	27s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	6m 47s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	5m 31s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	7m 7s
Tests / Unit tests / Unit tests (macos-latest, 3.10)	11m 8s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	4m 56s
Tests / Unit tests / Unit tests (macos-latest, 3.12)	4m 30s
Tests / Unit tests / Unit tests (macos-latest, 3.14)	5m 35s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	6m 58s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	3m 41s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	5m 22s
Tests / Unit tests / Unit tests (macos-latest, 3.11)	8m 18s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	5m 44s
Tests / Unit tests / Unit tests (macos-latest, 3.13)	4m 41s
	1h 39m 39s

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