Bump actions/cache from 4 to 5 (#65)

.github/workflows/backup.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Configure cache
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: |
             ${{ env.GITHUB_WORKSPACE }}

.github/workflows/ci.yml

@@ -40,7 +40,7 @@ jobs:
 
     steps:
       - name: Checkout Example.jl
-        uses: actions/checkout@v6
+        uses: actions/checkout@v5
         with:
           repository: julia-actions/Example.jl
 
@@ -49,7 +49,7 @@ jobs:
         shell: bash
 
       - name: Checkout julia-buildpkg
-        uses: actions/checkout@v6
+        uses: actions/checkout@v5
         with:
           path: ./.github/actions/julia-buildpkg