chore(third_party/sources): Update

- Apply new clippy lints

Change-Id: I4beb7c0b4d92a2cdcfcb6fa89d24cade2379a5b7
Reviewed-on: https://cl.snix.dev/c/snix/+/30121
Tested-by: besadii
Reviewed-by: Florian Klink <flokli@flokli.de>
Autosubmit: Ilan Joselevich <personal@ilanjoselevich.com>

snix/nix-compat-derive/src/internal/ctx.rs

@@ -16,12 +16,7 @@ impl Context {
     }
 
     pub fn syn_error(&self, error: syn::Error) {
-        self.errors
-            .borrow_mut()
-            .as_mut()
-            .take()
-            .unwrap()
-            .push(error);
+        self.errors.borrow_mut().as_mut().unwrap().push(error);
     }
 
     pub fn error_spanned<T: ToTokens, D: fmt::Display>(&self, tokens: T, message: D) {