test: fix flaky `test_request_queue_unlock_requests` #608

Job	Run time
PR title check	3s
Tests / Integration tests (3.11, ubuntu-latest)	2m 43s
Tests / Integration tests (3.14, ubuntu-latest)	2m 36s
Code checks / Spell check	7s
Code checks / Actions lint check	31s
Code checks / Type check / Type check (3.11)	17s
Code checks / Type check / Type check (3.12)	16s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	46s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	46s
Code checks / Type check / Type check (3.13)	22s
Code checks / Type check / Type check (3.14)	14s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	50s
Code checks / Lint check / Lint check (3.11)	12s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 5s
Doc checks / Doc checks / Docs check	1m 5s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 11s
Code checks / Lint check / Lint check (3.13)	10s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	44s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 12s
Code checks / Lint check / Lint check (3.14)	11s
Code checks / Lint check / Lint check (3.12)	12s
Docstrings checks / Docstrings checks	14s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 14s
	17m 1s

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