Fix emotion dataset chapter 2

[1Maxnet1]

As the former fix did not work, an update to the datasets library resolved the issue.

This is also indicated by several related comments I found in the Internet during my research:

• https://github.com/nlp-with-transformers/notebooks/pull/103
• https://github.com/nlp-with-transformers/notebooks/issues/113
• https://github.com/dair-ai/emotion_dataset/issues/5#issuecomment-1416841190
• https://huggingface.co/datasets/dair-ai/emotion/discussions/4#63ee495239dac6f3a64c56be