chore: set msrv to 1.89.0

Author: DaleSeo

Cargo.toml

@@ -11,7 +11,7 @@ authors = ["Apollo <[email protected]>"]
 edition = "2024"
 license-file = "LICENSE"
 repository = "https://github.com/apollographql/apollo-mcp-server"
-rust-version = "1.90.0"
+rust-version = "1.89.0"
 version = "0.9.0"
 
 [workspace.dependencies]