Remove urllib3 version pinning

The [issue with anaconda-client](anaconda/anaconda-client#654) was resolved.

Signed-off-by: Patrick Avery <patrick.avery@kitware.com>

.github/workflows/package.yml

@@ -50,9 +50,7 @@ jobs:
           conda config --set solver libmamba
 
           conda activate hexrd
-          # FIXME: downgrade urllib3 until this issue is fixed:
-          # https://github.com/Anaconda-Platform/anaconda-client/issues/654
-          conda install --override-channels -c conda-forge anaconda-client conda-build conda 'urllib3<2.0.0'
+          conda install --override-channels -c conda-forge anaconda-client conda-build conda
 
       # This is need to ensure ~/.profile or ~/.bashrc are used so the activate
       # command works.