Fixing nightlies

Author: ksbeattie

.github/workflows/nightlies.yml

@@ -51,7 +51,9 @@ jobs:
 
     steps: 
       - name: Set up Conda
-        uses: conda-incubator/setup-miniconda@v2
+        uses: conda-incubator/setup-miniconda@v3
+        with:
+          miniforge-version: "latest"
       - name: Install FOQUS in a Conda env (user mode)
         env:
           py_ver: ${{ matrix.python-version }}