Unofficially streamlit was supporting conda dependencies via the conda.txt file and custom conda channels via the conda_channles.txt file. If you were using this feature you should migrate to the new supported environment.yml configuration file.
Example of migrating from conda.txt and conda_channles.txt to environment.yml:
The two above files should be converted to one environment.yml file:
For more information about the environment.yml please consult the conda documentation.