dependabot: bump actions/cache from 4 to 5 (#266)

Author: dependabot[bot]

.github/workflows/cd-prod.yml

@@ -27,7 +27,7 @@ jobs:
           cache: 'pip'
 
       - name: caching
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           key: ${{ github.ref }}
           path: .cache

.github/workflows/cd-stage.yml

@@ -32,7 +32,7 @@ jobs:
           cache: 'pip'
 
       - name: caching
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           key: ${{ github.ref }}
           path: .cache