ci: add libarchive to dependencies

This is needed to work around a bug in conda.

Author: indygreg

.github/workflows/anaconda.yml

@@ -80,7 +80,7 @@ jobs:
 
       - name: Install Dependencies
         run: |
-          C:\Miniconda\condabin\conda.bat install --yes --quiet --name env conda-build pip
+          C:\Miniconda\condabin\conda.bat install --yes --quiet --name env conda-build libarchive pip
           C:\Miniconda\envs\env\python.exe -m pip install --user --require-hashes -r ci/requirements.txt
 
       - name: Build and Test