Try harder to make the binary smaller.

We ran out of flash space, but only on the GHA build not my local build...

Author: thejpster

Cargo.toml

@@ -34,7 +34,7 @@ required-features = ["native-log"]
 lto = true
 debug = true
 codegen-units = 1
-opt-level = "s"
+opt-level = "z"
 panic = "abort"
 
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