Perform the overrides → package rename

The unstable feature has changed the naming scheme
of the toml keys. For more info, see: rust-lang/cargo#7504

Cargo.toml

@@ -15,10 +15,10 @@ debug = false
 
 # This allows us to optimize dependencies
 # If you aren't on nightly, you can just comment this out.
-[profile.dev.overrides."*"]
+[profile.dev.package."*"]
 opt-level = 3
 
 # Also optimize mehlon-meshgen
 # Per default, workspace members are not included by "*".
-[profile.dev.overrides.mehlon-meshgen]
+[profile.dev.package.mehlon-meshgen]
 opt-level = 3