Use ubuntu-latest for workflows

Author: hcarlens

.github/workflows/main.yml

@@ -11,10 +11,10 @@ defaults:
 jobs:
   trigger-build:
     name: Trigger build
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: sleep for 30 seconds
         run: sleep 30s
         shell: bash
       - name: hit endpoint  
-        run: curl -X POST -d {} https://api.netlify.com/build_hooks/64c0e6ee7dfcba46046efe99
+        run: curl -X POST -d {} https://api.netlify.com/build_hooks/64c0e6ee7dfcba46046efe99