chore(deps): update rust crate rmcp to v3.5.1

[dvjn]

This PR contains the following updates:

Package	Type	Update	Change
rmcp	dependencies	minor	3.4.0 → 3.5.1

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Release Notes

modelcontextprotocol/rust-sdk (rmcp)

v3.5.1

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Fixed

• (server) keep discover lifecycle bootstrap-neutral (#​1248)
• keep handler-generated invalid params errors in-band (#​1322)
• (model) export object! macro without macros feature (#​1318)
• (server) default missing cache hints for 2026-07-28 peers (#​1308)

Other

• [rmcp] Notify credential stores when a refresh token is rejected (#​1285)

v3.5.0

Compare Source

Added

• update LATEST and add LATEST_WITH_INITIALIZE (#​1105)

Fixed

• (model) decode float fields through serde_json::Number (#​1300)
• (rmcp) reject duplicate sep-2243 headers (#​1274)
• (transport) match explicit default ports in Origin allowlist (#​1270)
• (rmcp) tolerate empty cacheScope instead of silently dropping the whole result (#​1281)
• (model) preserve explicit null structuredContent in CallToolResult (#​1295)

Other

• cargo fmt fixes on validate_standard_headers changes (#​1275)

v3.4.1

Compare Source

Fixed

• (transport) fall back after JSON discover rejections (#​1288)
• (macros) accept const paths and concat! in tool/prompt descriptions (#​1243)

Other

• (deps) update rstest requirement from 0.26.1 to 0.27.0 (#​1276)

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