Update runner to use ubuntu-latest

Author: hellertang

.github/workflows/release.yml

@@ -20,7 +20,7 @@ env:
 jobs:
   publish_binary:
     name: publish
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
     - name: Checkout Repo
       uses: actions/checkout@v2