set up macos-13 ci job

Author: lihaoyi

.github/workflows/run-tests.yml

@@ -84,11 +84,14 @@ jobs:
           # Run these with Mill native launcher as a smoketest
         include:
           - os: ubuntu-24.04-arm
-            millargs: example.kotlinlib.__.native.server.test
+            millargs: example.javalib.__.local.server.test
             java-version: 17
           - os: macos-latest
             millargs: example.scalalib.__.native.server.test
             java-version: 11
+          - os: macos-13
+            millargs: example.kotlinlib.__.native.server.test
+            java-version: 11
     steps:
       - uses: actions/checkout@v4
         with: { fetch-depth: 1 }
@@ -134,10 +137,6 @@ jobs:
             millargs: "contrib.__.test"
             install-android-sdk: false
 
-          - java-version: 17
-            millargs: "'example.javalib.__.local.server.test'"
-            install-android-sdk: false
-
           - java-version: 17
             millargs: "'example.android.__.local.server.test'"
             install-android-sdk: true