sameold: make assert_approx_eq a dev-dependency

`assert_approx_eq` provides macros for unit tests. This
dependency should not propagate to other workspace crates. Make
it a dev-dependency instead.

Author: cbs228

crates/sameold/Cargo.toml

@@ -13,7 +13,6 @@ readme = "README.md"
 [dependencies]
 arrayvec = "^0.7.1"
 arraydeque = "^0.5"
-assert_approx_eq = "1.1.0"
 lazy_static = "^1.4.0"
 log = "0.4"
 nalgebra = "^0.33.2"
@@ -26,6 +25,9 @@ strum = "^0.26"
 strum_macros = "^0.26"
 thiserror = "^2.0"
 
+[dev-dependencies]
+assert_approx_eq = "1.1.0"
+
 [dependencies.chrono]
 version = "^0.4"
 default-features = false