Merge pull request #314 from w3c/ubuntu-latest

GitHub actions: replace ubuntu-20.04 with ubuntu-latest

Author: jan-ivar

.github/workflows/auto-publish.yml

@@ -10,7 +10,7 @@ on:
 jobs:
   validate-and-publish:
     name: Validate and Publish
-    runs-on: ubuntu-20.04 # only linux supported at present
+    runs-on: ubuntu-latest # only linux supported at present
     steps:
       - uses: actions/checkout@v4
       - uses: w3c/spec-prod@v2 # use the action