Update publish.yml

Author: imagekitio

.github/workflows/publish.yml

@@ -6,7 +6,7 @@ on:
 
 jobs:
   deploy:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
             matrix:
                 python: [3.6, 3.7, 3.8, 3.9, '3.10']