Bump lit to 2.2.3 so it matches gerrit's version.

Change-Id: I6e51c8acfda8d4867006af6acf289d048dad5c54
diff --git a/package.json b/package.json
index 1c64761..54d7d58 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "gerrit-fe-dev-helper",
   "license": "MIT",
   "dependencies": {
-    "lit-element": "^2.2.1"
+    "lit-element": "^2.2.3"
   },
   "devDependencies": {
     "@bazel/bazel": "^1.1.0",