chore(deps): pin @handlebars/parser for ember-cli-addon-docs

There is an incompatibility with the two packages:
* ember-learn/ember-cli-addon-docs#1671
* ember-learn/ember-cli-addon-docs#1669
* https://github.com/handlebars-lang/handlebars-parser/releases/tag/v2.2.1-%40handlebars%2Fparser

Author: derrabauke

package.json

@@ -75,6 +75,9 @@
   },
   "packageManager": "pnpm@9.15.4",
   "pnpm": {
+    "overrides": {
+      "ember-cli-addon-docs>@handlebars/parser": "^2.2.1"
+    },
     "peerDependencyRules": {
       "ignoreMissing": [
         "typescript"