various fixes to 01_stable_diffusion_introduction.ipynb

[yuxi-liu-wired]

1. runwayml disappeared, so I changed the repo name.
2. fixed some deprecation warnings.
3. There is still one deprecation warning I don't know how to fix. IT is at

/opt/conda/lib/python3.10/site-packages/transformers/tokenization_utils_base.py:1614: FutureWarning: `clean_up_tokenization_spaces` was not set. It will be set to `True` by default. This behavior will be deprecated in transformers v4.45, and will be then set to `False` by default. For more details check this issue: https://github.com/huggingface/transformers/issues/31884
  warnings.warn(

which appears during

# Load the pipeline
model_id = "stabilityai/stable-diffusion-2-1-base"
pipe = StableDiffusionPipeline.from_pretrained(model_id).to(device)

Specifically, at loading pipeline components step 5, when loading the CLIP text encoder.

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