Switch release profile to lto=thin for faster builds

Author: LEON-gittech

codex-rs/Cargo.toml

@@ -456,7 +456,7 @@ debug = 0
 strip = true
 
 [profile.release]
-lto = "fat"
+lto = "thin"
 split-debuginfo = "off"
 # Because we bundle some of these executables with the TypeScript CLI, we
 # remove everything to make the binary as small as possible.