Bump MSRV to 1.84

Signed-off-by: Ryan Levick <[email protected]>

Author: rylev

Cargo.toml

@@ -12,7 +12,7 @@ edition = "2021"
 license = "Apache-2.0 WITH LLVM-exception"
 homepage = "https://spinframework.dev"
 repository = "https://github.com/spinframework/spin"
-rust-version = "1.81"
+rust-version = "1.84"
 
 [dependencies]
 anyhow = { workspace = true }