Update actions/cache action to v5

Author: renovate[bot]

.github/workflows/publish.yaml

@@ -22,7 +22,7 @@ jobs:
       - uses: actions/setup-python@v5
         with:
           python-version: 3.x
-      - uses: actions/cache@v4
+      - uses: actions/cache@v5
         with:
           key: ${{ github.ref }}
           path: .cache

.github/workflows/tests.yaml

@@ -16,7 +16,7 @@
           - uses: actions/setup-python@v5
             with:
               python-version: 3.x
-          - uses: actions/cache@v4
+          - uses: actions/cache@v5
             with:
               key: ${{ github.ref }}
               path: .cache