Change the codegen-units for low resources (#4336)

It seems (as disscusses here #4320) a single codegen unit makes it still
crash. This sets it to the default 16 Rust uses for the release profile.

Cargo.toml

@@ -197,7 +197,7 @@ panic = "abort"
 inherits = "release"
 strip = "symbols"
 lto = "thin"
-codegen-units = 1
+codegen-units = 16
 
 # Linting config
 [lints.rust]