test: var to const in test-repl-multiline.js

PR-URL: #30433
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

test/parallel/test-repl-multiline.js

@@ -5,7 +5,7 @@ const assert = require('assert');
 const repl = require('repl');
 const inputStream = new ArrayStream();
 const outputStream = new ArrayStream();
-const input = ['var foo = {', '};', 'foo;'];
+const input = ['const foo = {', '};', 'foo;'];
 let output = '';
 
 outputStream.write = (data) => { output += data.replace('\r', ''); };