chore(deps): update pnpm to v10.21.0 (#705)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package.json

@@ -16,7 +16,7 @@
     "node": ">=22",
     "pnpm": ">=10"
   },
-  "packageManager": "pnpm@10.20.0+sha512.cf9998222162dd85864d0a8102e7892e7ba4ceadebbf5a31f9c2fce48dfce317a9c53b9f6464d1ef9042cba2e02ae02a9f7c143a2b438cd93c91840f0192b9dd",
+  "packageManager": "pnpm@10.21.0+sha512.da3337267e400fdd3d479a6c68079ac6db01d8ca4f67572083e722775a796788a7a9956613749e000fac20d424b594f7a791a5f4e2e13581c5ef947f26968a40",
   "repository": {
     "type": "git",
     "url": "git+https://github.com/freeCodeCamp/ui.git"