code fix in the file rdspg-vector.ipynb

Simple code fix. In the file rdspg-vector.ipynb is this line to install prereqs:

!pip install -U psycopg2-binary pgvector tqdm boto3 requests

It should actually be:

!pip install -U psycopg2-binary pgvector tqdm boto3 requests scikit-image

Otherwise the code block near the end that performs the similarity search errors out on the line:

from skimage import io

stating "no such module" for skimage.

Open rdspg-vector.ipynb and inspect the prerequisite-install cell and the similarity-search block near the end. Run the notebook or at least the relevant cells to reproduce the missing skimage import, then verify that the dependency setup supports that import without errors.

Written by the indexing model from the issue text.