git action 虚拟机升级到ubuntu-latest

Author: CppCXY

.github/workflows/build.yml

@@ -57,7 +57,7 @@ jobs:
     name: Upload Release
     if: startsWith(github.ref, 'refs/tags/')
     needs: [build]
-    runs-on: [ubuntu-18.04]
+    runs-on: [ubuntu-latest]
     env:
       GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     steps: