Remove unused jest dependency

1args/features/steps/concat.js

@@ -1,9 +1,9 @@
 import { When, Then } from '@cucumber/cucumber'
-import { expect } from 'chai'
+import assert from 'node:assert/strict'
 
 When('I concatenate {string} and {string}', function (string, string2) {
 })
        
 Then('the result should be {string}', function (string) {
-  expect(string).to.equal("Georg Cantor")
+  assert.equal(string, 'Georg Cantor')
 })