fix: wording

Author: knopp

native_toolchain_rust/test/build_test.dart

@@ -77,7 +77,7 @@ dependency_overrides:
         }
         attempt++;
         // Windows being windows.
-        print('Failed to clean temp installer temp dir: $e');
+        print('Failed to clean builder temp dir: $e');
         await Future.delayed(const Duration(seconds: 1));
       }
     }

rustup/test/installer_test.dart

@@ -29,7 +29,7 @@ void main() {
           }
           attempt++;
           // Windows being windows.
-          print('Failed to clean temp installer temp dir: $e');
+          print('Failed to clean installer temp dir: $e');
           await Future.delayed(const Duration(seconds: 1));
         }
       }