chore(cypress): migrate to Cypress v6 (#40396)

* Update Cypress version from 5.3.0 to 6.0.0

* Replace `not.be.visible` with `not.exist`

Co-authored-by: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>

cypress/integration/learn/common-components/navbar.js

@@ -42,7 +42,7 @@ describe('Navbar', () => {
       cy.get('input').clear();
     });
 
-    cy.get('div.ais-Hits').should('not.be.visible');
+    cy.get('div.ais-Hits').should('not.exist');
   });
 
   it('Should have a Sign In button', () => {