Switch to ubuntu-latest on publish action

Author: JBlaak

.github/workflows/publish.yml

@@ -7,9 +7,9 @@ on:
 jobs:
   publish:
     name: Publish
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
       - uses: dylanvann/publish-github-action@v1.1.49
         with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
+          github_token: ${{ secrets.GITHUB_TOKEN }}