use miniforge

Author: Tieqiong

.github/workflows/osx64.yml

@@ -16,8 +16,6 @@ jobs:
       matrix:
         os: [macos-13]
         python-version: ["3.13"]
-    env:
-      LATEST_PYTHON_VERSION: "3.13"
     steps:
       - name: Check out diffpy.pdfgui
         uses: actions/checkout@v4
@@ -26,6 +24,7 @@ jobs:
         uses: conda-incubator/setup-miniconda@v3
         with:
           activate-environment: test
+          miniforge-version: latest
           auto-update-conda: true
           environment-file: environment.yml
           auto-activate-base: false