fix(tvix/nix-compat): don't box CAHash::Text

Change-Id: I31df3909bc21c9038f9fb831879e60e541242819
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9853
Tested-by: BuildkiteCI
Reviewed-by: flokli <flokli@flokli.de>

tvix/nix-compat/src/derivation/validate.rs

@@ -141,7 +141,7 @@ mod test {
             "out".to_string(),
             Output {
                 path: "".to_string(),
-                ca_hash: Some(CAHash::Text(Box::new([0; 32]))), // This is disallowed
+                ca_hash: Some(CAHash::Text([0; 32])), // This is disallowed
             },
         );