fix(miniflare): skip SNI for Hyperdrive IP targets

[edmundhung]

Fixes #13599 .

The hyperdrive test fails in Node 25 as it has a stricter validation on servername and fails if it is an IP address.

No changeset as the corresponding change is not yet released.

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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[ask-bonk]

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commit: e1564c3

[ask-bonk]

The fix is correct. net.isIP() returns 0 for non-IP strings (hostnames), 4 for IPv4, and 6 for IPv6. The condition net.isIP(targetHost) === 0 properly gates servername to only be set for hostnames.

This aligns with the TLS/SNI specification (RFC 6066 section 3), which states that SNI HostName must be a DNS hostname, not an IP address. Node.js 25 enforces this more strictly, causing the test failure described in the linked issue.

The net module is already imported at line 2, so no new dependency is introduced. The change is minimal and well-targeted.

LGTM

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