chore(deps): update actions/cache action to v5

Author: renovate[bot]

.github/workflows/ci.yml

@@ -39,7 +39,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: Cache Go modules
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ~/go/pkg/mod
           key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}