chore: use Headers.getSetCookie

[kettanaito]

• Drop TypeScript 5.0 and 5.1, add 5.9.
• Use Headers.prototype.getSetCookie() instead of headers-polyfill.
• Correctly handle multiple set-cookie response headers now.

We still rely on headers-polyfil for multipart data when parsing headers of individual multipart chunks.

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@src/core/utils/request/storeResponseCookies.ts`:
- Around line 8-14: The current use of Promise.all with getRawSetCookie(...)
causes concurrent cookieStore.setCookie(...) calls and can break header
application order; change the logic in the storeResponseCookies flow to apply
Set-Cookie headers sequentially (e.g., iterate over getRawSetCookie(response)
with for/for-of and await each cookieStore.setCookie(responseCookie,
request.url) before continuing) so each jar mutation and persist completes in
wire order rather than concurrently.

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📥 Commits

Reviewing files that changed from the base of the PR and between 9eb5e9b and 948b3b4.

📒 Files selected for processing (4)

• .github/workflows/compat.yml
• src/core/handlers/RequestHandler.ts
• src/core/utils/HttpResponse/decorators.ts
• src/core/utils/request/storeResponseCookies.ts

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commit: 5413dba