CI: Fix only restore cache

Author: TheOneRing

.github/workflows/main.yml

@@ -76,7 +76,7 @@ jobs:
 
     - name: Restore cache
       if: github.event_name == 'pull_request'
-      uses: actions/cache@v4
+      uses: actions/cache/restore@v4
       with:
         path: |
           ~/cache