Use fake timers for UTD error code tests

This doesn't have any effect on the tests, but *does* stop jest from hanging
when you run the tests in in-band mode. It shouldn't *really* be needed, but
using fake timers gives more reproducible tests, and I don't have the
time/patience to debug why it is needed.

spec/integ/crypto/crypto.spec.ts

@@ -469,6 +469,10 @@ describe.each(Object.entries(CRYPTO_BACKENDS))("crypto (%s)", (backend: string,
     });
 
     describe("Unable to decrypt error codes", function () {
+        beforeEach(() => {
+            jest.useFakeTimers({ doNotFake: ["queueMicrotask"] });
+        });
+
         it("Decryption fails with UISI error", async () => {
             expectAliceKeyQuery({ device_keys: { "@alice:localhost": {} }, failures: {} });
             await startClientAndAwaitFirstSync();