Remove unnecessary KJ_LIFETIMEBOUND on getRelative() in url.h

[jasnell]

No description provided.

[ask-bonk]

The analysis is clear. The Url::Relative struct (lines 144-147 of url.h) contains:

• Url base — an owned Url value
• kj::String name — an owned string

The getRelative() implementation (lines 366-371) constructs a new Relative with a freshly resolved base URL and a freshly allocated kj::str(...) for name. The returned Relative struct is fully independent of the Url object it was called on — it owns all its data. KJ_LIFETIMEBOUND is incorrect here because it would warn callers that the returned value's lifetime is bound to the Url, when in fact it's not.

LGTM

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