Merged PR 26667: Update examples submodule to fix vulnerability issues

Updating examples submodule using [protobuf 3.20.2](marian-nmt/marian-examples#29) to fix recent [vulnerability issues](https://machinetranslation.visualstudio.com/MachineTranslation/_componentGovernance/mtmain/alert/8035094?typeId=14698327&pipelinesTrackingFilter=0).

Related work items: #134319