Update CreateSignNuGet.yml

Author: MichielOda

.github/workflows/CreateSignNuGet.yml

@@ -7,8 +7,7 @@ on:
   # Triggers the workflow on push or pull request events but only for the master branch
   push:
     branches:
-      - main
-      - master
+      - internalMain
     tags:
       - '[0-9]+.[0-9]+.[0-9]+'
       - '[0-9]+.[0-9]+.[0-9]+-[0-9a-zA-Z]+'