test CI: mac13, ubuntu20

Author: zhangrengang

.github/workflows/main-linux.yml

@@ -16,7 +16,7 @@ jobs:
   build:
     # The type of runner that the job will run on
 #    runs-on: ubuntu-latest
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-20.04
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
     - uses: actions/checkout@v4

.github/workflows/main-mac.yml

@@ -5,7 +5,7 @@ on: [push]
 jobs:
   build:
 #    runs-on: macos-latest
-    runs-on: macos-15
+    runs-on: macos-13
     strategy:
       max-parallel: 5