Update dependabot.yml

Author: jan-janssen

.github/workflows/dependabot.yml

@@ -26,6 +26,7 @@ jobs:
           sed -i "/${package}/s/${from}/${to}/g" .ci_support/environment-openmpi.yml
           sed -i "/${package}/s/${from}/${to}/g" .ci_support/environment-win.yml
           sed -i "/${package}/s/${from}/${to}/g" .ci_support/environment-docs.yml
+          sed -i "/${package}/s/${from}/${to}/g" binder/environment.yml
       - name: UpdateDependabotPR commit
         run: |
           git config --local user.email "[email protected]"