fix: sync package version to v1.20.2 tag

The v1.20.2 release tag was created but nodejs/package.json (and the
lockfile) were left at 1.20.1, so the deployed app's buildVersion lagged
its own release tag and the update-check banner falsely reported a newer
version. Bump the version fields to match the tag.

nodejs/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "t42-sso-manager",
-  "version": "1.20.1",
+  "version": "1.20.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "t42-sso-manager",
-      "version": "1.20.0",
+      "version": "1.20.2",
       "license": "MIT",
       "dependencies": {
         "@fortawesome/fontawesome-free": "^7.3.0",