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

Author: renovate[bot]

.github/workflows/gh-pages.yml

@@ -31,7 +31,7 @@ jobs:
           version: 'latest'
           run_install: false
       - name: Cache dependencies
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             **/node_modules

.github/workflows/upgrade.yml

@@ -25,7 +25,7 @@ jobs:
           version: 'latest'
           run_install: false
       - name: Cache dependencies
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             **/node_modules