[ci] Run the release job on ubuntu-latest

Author: lpinca

.github/workflows/ci.yml

@@ -42,7 +42,7 @@ jobs:
   release:
     if: startsWith(github.ref, 'refs/tags/')
     needs: test
-    runs-on: ubuntu-16.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
       - uses: actions/download-artifact@v2