test: fix flaky `test_request_queue_unlock_requests` #607

Job	Run time
Docstrings checks / Docstrings checks	12s
Code checks / Actions lint check	31s
Code checks / Spell check	4s
Tests / Integration tests (3.11, ubuntu-latest)	2m 35s
Doc checks / Doc checks / Docs check	55s
Tests / Integration tests (3.14, ubuntu-latest)	2m 26s
Code checks / Lint check / Lint check (3.13)	11s
PR title check	6s
Code checks / Lint check / Lint check (3.12)	11s
Code checks / Lint check / Lint check (3.11)	10s
Code checks / Type check / Type check (3.12)	10s
Code checks / Type check / Type check (3.11)	9s
Code checks / Type check / Type check (3.13)	14s
Code checks / Type check / Type check (3.14)	13s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 10s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 10s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	52s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	44s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	45s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	47s
Code checks / Lint check / Lint check (3.14)	12s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 17s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 2s
	16m 6s

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