[DL Edition] ignore unresponsive sites

[mbackenkoehler]

There are a few dead/unresponsive links, that need to be ignored in .github/workflows/docs.yml

talktorials/T033_molecular_representations.html

• [403] https://wires.onlinelibrary.wiley.com/doi/full/10.1002/wcms.1603
• [403] https://chemistry-europe.onlinelibrary.wiley.com/doi/abs/10.1002/cphc.201800148

talktorials/T037_uncertainty_estimation.html

• [403] https://wires.onlinelibrary.wiley.com/doi/abs/10.1002/widm.1249?casa_token=1RRjvfS1_k4AAAAA%3AdR5WbRw9n8cp8wuVWx4j1ygfElNKbIJ9wXSmIeBd3C61pD1TEqX0bqswzRhNl8vY1rLDEhl29dseag