Bump preact from 10.0.0-alpha.2 to 10.0.0-alpha.4

Bumps [preact](https://github.com/developit/preact) from 10.0.0-alpha.2 to 10.0.0-alpha.4.
- [Release notes](https://github.com/developit/preact/releases)
- [Commits](https://github.com/developit/preact/compare/10.0.0-alpha.2...10.0.0-alpha.4)
Signed-off-by: dependabot[bot] <support@dependabot.com>

package.json

@@ -91,7 +91,7 @@
     "npm-packlist": "^1.1.12",
     "postcss": "^7.0.13",
     "postcss-url": "^8.0.0",
-    "preact": "10.0.0-alpha.2",
+    "preact": "10.0.0-alpha.4",
     "prettier": "1.16.4",
     "proxyquire": "^2.1.0",
     "proxyquire-universal": "^2.1.0",

yarn.lock

@@ -7735,10 +7735,10 @@ preact-render-to-string@^4.1.0:
   dependencies:
     pretty-format "^3.8.0"
 
-preact@10.0.0-alpha.2:
-  version "10.0.0-alpha.2"
-  resolved "https://registry.yarnpkg.com/preact/-/preact-10.0.0-alpha.2.tgz#61ba4f2ca20b75352ad5ed8aa239302df83dae74"
-  integrity sha512-8G0UFC0Sa/giqI/jR3LIHzj0ohsIC4wnB+8+XdpHFEZ5GmtFLmQgkrrkdR0EcEAdd38geClUSj30H8AEIO4OqA==
+preact@10.0.0-alpha.4:
+  version "10.0.0-alpha.4"
+  resolved "https://registry.yarnpkg.com/preact/-/preact-10.0.0-alpha.4.tgz#c0cf81771fa7aaa3e71adf8741b1e341e2cc4bd1"
+  integrity sha512-HD8ocvxID8NjC6m0rZhY1HbbBIHBKw7E4/0nu/zulPcGhgXEjm2BD9Tt8wQdoa/nea3APJ72TxRJSg2oQmU3uA==
   dependencies:
     prop-types "^15.6.2"