Bug#963771: nodejs breaks node-immutable-tuple autopkgtest: can handle a lot of strings: AssertionError

[Olivier Tilloy]

An upstream change in Node.js is causing this test failure:
https://github.com/nodejs/node/commit/a0f338ecc1

The solution is to remove the offending test:
https://salsa.debian.org/js-team/node-immutable-tuple/-/merge_requests/1