Improve SSRF performance: re-use extracted hostname from URL

[hansott]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 80.51948% with 15 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
library/sinks/http-request/wrapResponseHandler.ts	16.66%	5 Missing ⚠️
library/vulnerabilities/ssrf/Hostname.ts	81.48%	5 Missing ⚠️
library/sinks/Undici.ts	62.50%	3 Missing ⚠️
...rary/vulnerabilities/ssrf/inspectDNSLookupCalls.ts	75.00%	2 Missing ⚠️

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