chore(deps): update actions/cache action to v4

Author: renovate[bot]

.github/workflows/lint.yml

@@ -88,7 +88,7 @@ jobs:
     steps:
       - name: Cache nextcloud server
         id: nextcloud_setup
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: nextcloud-${{ matrix.server-versions }}.zip
           key: ${{ matrix.server-versions }}

.github/workflows/test.yml

@@ -51,7 +51,7 @@ jobs:
 
       - name: cache-nextcloud
         id: nextcloud_setup
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: nextcloud-${{ matrix.nextcloud }}.tar.bz2
           key: ${{ matrix.nextcloud }}
@@ -198,7 +198,7 @@ jobs:
 
       - name: cache-nextcloud
         id: nextcloud_setup
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: nextcloud-${{ matrix.nextcloud }}.tar.bz2
           key: ${{ matrix.nextcloud }}