chore(deps): update actions/cache action to v5

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -42,7 +42,7 @@ jobs:
 
       - name: Cache dependencies
         id: cache-ghostty
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             /var/cache/pacman