fix(deps): replace retired transitive crates

compat/spin/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "spin"
+version = "0.9.8"
+edition = "2021"
+rust-version = "1.71"
+publish = false
+license = "MIT"
+description = "Workspace compatibility alias from yanked spin 0.9 to maintained spin 0.12"
+
+[features]
+default = []
+spin_mutex = ["spin_next/spin_mutex"]
+
+[dependencies]
+spin_next = { package = "spin", version = "=0.12.2", default-features = false }

compat/spin/src/lib.rs

@@ -0,0 +1,6 @@
+#![forbid(unsafe_code)]
+
+//! Compatibility export for dependencies that still require yanked `spin 0.9`.
+//! New code should depend on the maintained `spin` release directly.
+
+pub use spin_next::*;