feat: Update Cargo.toml to optimise binaries for size

see: https://github.com/cafkafk/eza/pull/23#issuecomment-1656739548

Co-authored-by: sbatial <mail@kbode.com>
Signed-off-by: Christina Sørensen <christina@cafkafk.com>

Cargo.toml

@@ -62,8 +62,7 @@ debug = false
 [profile.release]
 lto = true
 strip = true
-opt-level = "z"
-codegen-units = 1
+opt-level = "s"
 
 
 [package.metadata.deb]