chore(deps): update pnpm to v11.8.0 (#162)

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

Author: renovate[bot]

package.json

@@ -1,9 +1,9 @@
 {
   "name": "backstage-renovate-config",
-  "packageManager": "pnpm@11.7.0",
+  "packageManager": "pnpm@11.8.0",
   "volta": {
     "node": "24.17.0",
-    "pnpm": "11.7.0"
+    "pnpm": "11.8.0"
   },
   "type": "module",
   "scripts": {