Disable flaky verification test for Element-R (#11802)

cypress/e2e/crypto/crypto.spec.ts

@@ -278,6 +278,7 @@ describe("Cryptography", function () {
     });
 
     it("should allow verification when there is no existing DM", function (this: CryptoTestContext) {
+        skipIfRustCrypto(); // https://github.com/vector-im/element-web/issues/26447
         cy.bootstrapCrossSigning(aliceCredentials);
         autoJoin(this.bob);