fix: Guard ReentrantLock against None task context #326

Job	Run time
PR title check	3s
Code checks / Spell check	5s
Code checks / Actions lint check	31s
Tests / E2E tests (3.10, ubuntu-latest)	4m 52s
Tests / E2E tests (3.14, ubuntu-latest)	4m 55s
Tests / Integration tests (3.14, ubuntu-latest)	3m 5s
Tests / Integration tests (3.10, ubuntu-latest)	2m 30s
Code checks / Lint check / Lint check (3.14)	15s
Code checks / Lint check / Lint check (3.10)	13s
Code checks / Type check / Type check (3.13)	11s
Code checks / Type check / Type check (3.14)	18s
Doc checks / Doc checks / Docs check	1m 19s
Code checks / Lint check / Lint check (3.13)	15s
Code checks / Lint check / Lint check (3.12)	11s
Code checks / Type check / Type check (3.12)	15s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	1m 5s
Code checks / Lint check / Lint check (3.11)	13s
Code checks / Type check / Type check (3.11)	9s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	58s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	1m 0s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	1m 19s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	1m 25s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	1m 1s
Code checks / Type check / Type check (3.10)	13s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	1m 35s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	1m 4s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	1m 44s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	1m 26s
	32m 10s

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