ci: bump actions

Author: UltiRequiem

.github/workflows/code-coverage.yaml

@@ -30,7 +30,7 @@ jobs:
           go tool cover -html=coverage.out -o coverage.html
 
       - name: Upload coverage report
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: coverage-report
           path: coverage.html
@@ -44,7 +44,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Download coverage report
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v4
         with:
           name: coverage-report
           path: ./coverage