fix: correct deadline logic in _wait_for_finish #518

Job	Run time
PR title check	5s
Docstrings checks / Docstrings checks	12s
Tests / Integration tests (3.11, ubuntu-latest)	2m 18s
Code checks / Actions lint check	28s
Tests / Integration tests (3.14, ubuntu-latest)	2m 39s
Code checks / Spell check	9s
Doc checks / Doc checks / Docs check	1m 19s
Code checks / Type check / Type check (3.12)	11s
Code checks / Type check / Type check (3.13)	16s
Code checks / Lint check / Lint check (3.11)	11s
Code checks / Lint check / Lint check (3.12)	9s
Code checks / Type check / Type check (3.14)	14s
Code checks / Type check / Type check (3.11)	14s
Code checks / Lint check / Lint check (3.13)	14s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 15s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 0s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	2m 50s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	37s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	52s
Code checks / Lint check / Lint check (3.14)	17s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	57s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	51s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	35s
	17m 53s

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