Merge pull request #3079 from dpfaffenbauer/fix/gitsplit-5.1

[CI] trigger monorepo split on 5.1 branch

Author: dpfaffenbauer

.github/workflows/gitsplit.yml

@@ -12,6 +12,7 @@ on:
             - 4.0
             - 4.1
             - 5.0
+            - 5.1
         paths:
             - 'src/CoreShop/Bundle/**'
             - 'src/CoreShop/Component/**'