feat(segments): add SegmentUpdateAsync for PATCH /segments/:id

[dielduarte]

Adds SegmentUpdateAsync for PATCH /segments/:id, which renames a segment.

var resp = await resend.SegmentUpdateAsync( segmentId, new SegmentData()
{
    Name = "New segment name",
} );

Console.WriteLine( resp.Content.Name );

Params

• name (string, required) — the new segment name.

Response

{
  "object": "segment",
  "id": "...",
}

[cubic-dev-ai]

No issues found across 8 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

<sub>Requires human review: Adds new public SegmentUpdateAsync API for PATCH /segments/:id plus CLI command and fake server; needs human sign-off because it expands the public API surface and is a new feature, not a bounded fix.

Re-trigger cubic</sub>

[cubic-dev-ai]

0 issues found across 3 files (changes from recent commits).

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

<sub>Requires human review: Adds new public SegmentUpdateAsync API for PATCH /segments/:id plus CLI command and fake server; expands public API surface as a new feature, so needs human sign-off.

Re-trigger cubic</sub>

[gabrielmfern]

let's maybe not update the CLI? we've already deprecated it anyway, we don't need to update it