DeepChem Updates of January (Week 3), 2024

Here is a quick summary of merged pull requests for DeepChem during the third week of January:
1. Ci fixes : This PR fixes some CI bugs.
2. Docs Build Fix : This PR fixes broken docs build CI.
3. Doctest Ci error fixes : This PR fixes Doctest CI error.
4. Purefunction-1 : This PR fixes an issue related to pure function.