Pin cspell version (#6751)

package.json

@@ -128,6 +128,6 @@
     "build": "node --max-old-space-size=3072 ./scripts/build/build.js",
     "build-docs": "node ./scripts/build-docs.js",
     "check-deps": "node ./scripts/check-deps.js",
-    "spellcheck": "npx cspell {bin,scripts,src}/**/*.js {docs,website/blog}/**/*.md CHANGELOG.unreleased.md"
+    "spellcheck": "npx cspell -p cspell@4.0.31 {bin,scripts,src}/**/*.js {docs,website/blog}/**/*.md CHANGELOG.unreleased.md"
   }
 }