test: fix flaky `test_request_queue_unlock_requests` #615

Job	Run time
PR title check	4s
Docstrings checks / Docstrings checks	12s
Code checks / Actions lint check	29s
Code checks / Spell check	7s
Doc checks / Doc checks / Docs check	1m 0s
Code checks / Type check / Type check (3.12)	14s
Code checks / Lint check / Lint check (3.14)	14s
Code checks / Type check / Type check (3.13)	14s
Code checks / Type check / Type check (3.14)	16s
Code checks / Lint check / Lint check (3.11)	11s
Tests / Integration tests (3.11, ubuntu-latest)	2m 27s
Code checks / Lint check / Lint check (3.13)	10s
Tests / Integration tests (3.14, ubuntu-latest)	2m 43s
Code checks / Lint check / Lint check (3.12)	10s
Code checks / Type check / Type check (3.11)	14s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	40s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	41s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 11s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 8s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	45s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	46s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 12s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	59s
	16m 7s

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