fix missing req. arg for new datasets package

[Borda]

Why are these changes needed?

seems recent CI is not passing at all due to changes in the datasets package which now for loading requires specifying trust_remote_code=True|False

Related issue number

actual state on the main branch
cc: @thinkall
see: EleutherAI/lm-evaluation-harness#1135

Checks

• I've included any doc changes needed for https://microsoft.github.io/FLAML/. See https://microsoft.github.io/FLAML/docs/Contribute#documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[thinkall]

Thank you @Borda !