chore(deps): update pnpm to v10.8.0 (#649)

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

desktop/package.json

@@ -5,7 +5,7 @@
   "main": "main.js",
   "repository": "https://code.vikunja.io/desktop",
   "license": "GPL-3.0-or-later",
-  "packageManager": "pnpm@9.15.9",
+  "packageManager": "pnpm@10.8.0",
   "author": {
     "email": "maintainers@vikunja.io",
     "name": "Vikunja Team"

frontend/package.json

@@ -13,7 +13,7 @@
   },
   "homepage": "https://vikunja.io/",
   "funding": "https://opencollective.com/vikunja",
-  "packageManager": "pnpm@10.7.1",
+  "packageManager": "pnpm@10.8.0",
   "keywords": [
     "todo",
     "productivity",