Update to rmcp 3.1.0

rmcp left beta on 2026-07-28 and reached 3.1.0 on 2026-07-31, so the pin
moves off 3.0.0-beta.2.

get_info now sets server_info. ServerInfo::default() reports rmcp own crate
name and version, so the server was identifying itself as rmcp 3.1.0
rather than weather 1.0.0 as the other three quickstarts do.

The hand-written list_tools stays: rmcp-macros 3.1.0 still generates
ttl_ms: None, cache_scope: None, which a strict client rejects.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

weather-server-rust/src/main.rs

@@ -286,6 +286,9 @@ impl Weather {
 impl ServerHandler for Weather {
     fn get_info(&self) -> ServerInfo {
         let mut info = ServerInfo::default();
+        // Without this the server reports rmcp's own crate name and version
+        // rather than its own.
+        info.server_info = Implementation::new("weather", "1.0.0");
         info.capabilities = ServerCapabilities::builder().enable_tools().build();
         info
     }