变更编译环境为 ubuntu-18.04

Author: RikudouPatrickstar

.github/workflows/jbr-linux-x64.yml

@@ -15,7 +15,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-18.04
     steps:
     - name: Clone Repository
       uses: actions/checkout@v3