Bump Lit version to 3.0.0

This led to a build failure reported by rollup-plugin-terser. It could
not handle ??= (ES2020) operators. Upgrading the plugin solved this
issue.

Release-Notes: skip
Change-Id: Ie6c5acc0112ebe74881f69202f9444a7fb4f132d
diff --git a/polygerrit-ui/yarn.lock b/polygerrit-ui/yarn.lock
index 751b807..6e8259c 100644
--- a/polygerrit-ui/yarn.lock
+++ b/polygerrit-ui/yarn.lock
@@ -1749,13 +1749,20 @@
     "@types/chai" "*"
     "@types/sinon" "*"
 
-"@types/sinon@*", "@types/sinon@^10.0.15":
+"@types/sinon@*":
   version "10.0.16"
   resolved "https://registry.yarnpkg.com/@types/sinon/-/sinon-10.0.16.tgz#4bf10313bd9aa8eef1e50ec9f4decd3dd455b4d3"
   integrity sha512-j2Du5SYpXZjJVJtXBokASpPRj+e2z+VUhCPHmM6WMfe3dpHu6iVKJMU6AiBcMp/XTAYnEj6Wc1trJUWwZ0QaAQ==
   dependencies:
     "@types/sinonjs__fake-timers" "*"
 
+"@types/sinon@^10.0.16":
+  version "10.0.20"
+  resolved "https://registry.yarnpkg.com/@types/sinon/-/sinon-10.0.20.tgz#f1585debf4c0d99f9938f4111e5479fb74865146"
+  integrity sha512-2APKKruFNCAZgx3daAyACGzWuJ028VVCUDk6o2rw/Z4PXT0ogwdV4KUegW0MwVs0Zu59auPXbbuBJHF12Sx1Eg==
+  dependencies:
+    "@types/sinonjs__fake-timers" "*"
+
 "@types/sinonjs__fake-timers@*":
   version "8.1.2"
   resolved "https://registry.yarnpkg.com/@types/sinonjs__fake-timers/-/sinonjs__fake-timers-8.1.2.tgz#bf2e02a3dbd4aecaf95942ecd99b7402e03fad5e"