Do not mix defaults and conda-forge in linux_wheel job (#975)

Author: traversaro

.github/workflows/linux_wheel.yaml

@@ -71,10 +71,14 @@ jobs:
           name: meta-pytorch_torchcodec__${{ matrix.python-version }}_cpu_x86_64
           path: pytorch/torchcodec/dist/
       - name: Setup conda env
-        uses: conda-incubator/setup-miniconda@v2
+        uses: conda-incubator/setup-miniconda@v3
         with:
           auto-update-conda: true
-          miniconda-version: "latest"
+          # Using miniforge instead of miniconda ensures that the default
+          # conda channel is conda-forge instead of main/default. This ensures
+          # ABI consistency between dependencies:
+          # https://conda-forge.org/docs/user/transitioning_from_defaults/
+          miniforge-version: latest
           activate-environment: test
           python-version: ${{ matrix.python-version }}
       - name: Update pip