Upgrade dependencies (#8749)

* [create-pull-request] automated change

* Remove conflicting HTMLStyleElement type improvement

* Pin postcss-hexrgba as 2.1.0 needs postcss 8

* Bump typescript version

* Add missing crypto stub

Co-authored-by: t3chguy <t3chguy@users.noreply.github.com>
Co-authored-by: Michael Telatynski <7t3chguy@gmail.com>

test/utils/MegolmExportEncryption-test.ts

@@ -76,6 +76,7 @@ describe('MegolmExportEncryption', function() {
         window.crypto = {
             subtle: webCrypto.subtle,
             getRandomValues,
+            randomUUID: jest.fn().mockReturnValue("not-random-uuid"),
         };
         MegolmExportEncryption = require("../../src/utils/MegolmExportEncryption");
     });