Update workflow

Author: soffes

.github/workflows/main.yml

@@ -3,10 +3,10 @@ on: [push]
 jobs:
   test:
     name: Test
-    runs-on: macOS-13
+    runs-on: macOS-15
     timeout-minutes: 5
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Run tests
         run: swift test