Update pnpm version in GitHub Actions workflow to 10.26.1 for consistency and improved performance.

.github/workflows/validate-pr.yml

@@ -48,6 +48,8 @@ jobs:
 
       - uses: pnpm/action-setup@v4
         name: Install pnpm
+        with:
+          version: 10.26.1
 
       - name: Get pnpm store directory
         shell: bash

package.json

@@ -115,7 +115,6 @@
       "release": true
     }
   },
-  "packageManager": "pnpm@10.26.1",
   "pnpm": {
     "ignoredBuiltDependencies": [
       "@parcel/watcher",