fix: Prevent list modification during iteration in BrowserPool #189

Job	Run time
Code checks / Spell check	6s
Code checks / Actions lint check	31s
PR title check	6s
Code checks / Type check / Type check (3.14)	28s
Code checks / Type check / Type check (3.10)	30s
Code checks / Lint check / Lint check (3.12)	25s
Code checks / Lint check / Lint check (3.10)	28s
Code checks / Type check / Type check (3.11)	26s
Code checks / Lint check / Lint check (3.14)	31s
Code checks / Type check / Type check (3.12)	35s
Code checks / Lint check / Lint check (3.13)	30s
Code checks / Type check / Type check (3.13)	29s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.12)	5m 34s
Tests / Unit tests / Unit tests (windows-latest, 3.13)	5m 57s
Tests / Unit tests / Unit tests (windows-latest, 3.12)	6m 13s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.11)	4m 10s
Tests / Unit tests / Unit tests (macos-latest, 3.10)	6m 14s
Tests / Unit tests / Unit tests (macos-latest, 3.13)	10m 3s
Tests / Unit tests / Unit tests (windows-latest, 3.10)	5m 41s
Tests / Unit tests / Unit tests (macos-latest, 3.12)	5m 30s
Tests / Unit tests / Unit tests (windows-latest, 3.11)	6m 21s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.14)	3m 14s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.10)	4m 29s
Tests / Unit tests / Unit tests (macos-latest, 3.11)	6m 12s
Tests / Unit tests / Unit tests (windows-latest, 3.14)	4m 59s
Tests / Unit tests / Unit tests (macos-latest, 3.14)	4m 38s
Doc checks / Doc checks / Docs check	1m 50s
Code checks / Lint check / Lint check (3.11)	26s
Tests / Unit tests / Unit tests (ubuntu-latest, 3.13)	4m 8s
	1h 30m 44s

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