Add executuble permission for check.sh (#5262)

Fails on CI:

https://teamcity.jetbrains.com/buildConfiguration/JetBrainsPublicProjects_Compose_Task4ValidateTemplatesTutorials/5047611?buildTab=log&mode=list&state=failed&type=snapshot&linesState=362&logView=flowAware

## Release Notes
N/A

Author: igordmn