Apply github lint actions both for 'experimental' and its 'next' alias branch.

Author: jonasbardino

.github/workflows/python-sanity-check.yml

@@ -5,9 +5,13 @@ name: Python application
 
 on:
   push:
-    branches: [ "experimental" ]
+    branches:
+      - experimental
+      - next
   pull_request:
-    branches: [ "experimental" ]
+    branches:
+      - experimental
+      - next
 
 permissions:
   contents: read