Update dependency lit-html to v1.2.1

Author: renovate-bot

package.json

@@ -39,7 +39,7 @@
   "dependencies": {
     "@abraham/remotedata": "0.8.0",
     "@nutmeg/seed": "0.17.0",
-    "lit-html": "1.1.2"
+    "lit-html": "1.2.1"
   },
   "devDependencies": {
     "@nutmeg/cli": "0.17.0"