fix: Gracefully close sitemap stream on `SitemapRequestLoader` abort #728

Job	Run time
PR title check	3s
Checks / Spell check	6s
Checks / Package check	36s
Checks / Actions lint check	33s
Checks / Doc check / Docs check	1m 44s
Checks / Lint check / Lint check (3.11)	32s
Checks / Lint check / Lint check (3.10)	29s
Checks / Type check / Type check (3.12)	28s
Checks / Lint check / Lint check (3.13)	30s
Checks / Lint check / Lint check (3.14)	27s
Checks / Lint check / Lint check (3.12)	34s
Checks / Type check / Type check (3.14)	32s
Checks / Type check / Type check (3.11)	32s
Checks / Type check / Type check (3.10)	30s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.14)	4m 0s
Checks / Unit tests / Unit tests (windows-latest, 3.10)	6m 22s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.11)	4m 50s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.10)	5m 33s
Checks / Type check / Type check (3.13)	34s
Checks / Unit tests / Unit tests (windows-latest, 3.12)	7m 5s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.13)	4m 59s
Checks / Unit tests / Unit tests (windows-latest, 3.11)	7m 42s
Checks / Unit tests / Unit tests (macos-latest, 3.10)	4m 31s
Checks / Unit tests / Unit tests (macos-latest, 3.14)	3m 24s
Checks / Unit tests / Unit tests (macos-latest, 3.12)	5m 8s
Checks / Unit tests / Unit tests (windows-latest, 3.13)	7m 0s
Checks / Unit tests / Unit tests (macos-latest, 3.13)	4m 59s
Checks / Unit tests / Unit tests (ubuntu-latest, 3.12)	5m 47s
Checks / Unit tests / Unit tests (windows-latest, 3.14)	5m 19s
Checks / Unit tests / Unit tests (macos-latest, 3.11)	4m 11s
	1h 29m 0s

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