chore: increase timeout for experimental retries test (#28163)

Author: cacieprins

packages/app/cypress/e2e/runner/retries.experimentalRetries.mochaEvents.cy.ts

@@ -391,7 +391,7 @@ describe('Experimental retries: mochaEvents & test status tests', { retries: 0,
       describe('cleanses errors before emitting', () => {
         it('does not try to serialize error with err.actual as DOM node', function (done) {
           // because there are more attempts for 'detect-flake-but-always-fail', the timeout needs to be increased
-          this.timeout(15000)
+          this.timeout(20000)
 
           const { assertMatchingSnapshot } = runCypressInCypressMochaEventsTest(
             snapshots,