Update actions/cache action to v5

Author: renovate[bot]

.github/workflows/docker-push.yml

@@ -29,7 +29,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Get Ivy2 cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ~/.ivy2
           key: ivy2-files

.github/workflows/tests.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Get Ivy2 cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ~/.ivy2
           key: ivy2-files