Restore Python 3.10 to have compat with conda-build 3.25

.github/workflows/main.yml

@@ -140,12 +140,14 @@ jobs:
       env:
         CONDA_BUILD_SYSROOT: ${{ steps.setup-macos-sdk.outputs.conda-build-sysroot }}
     - name: Set Up Conda
-      uses: conda-incubator/setup-miniconda@v3
+      uses: conda-incubator/setup-miniconda@v2.1.1
       with:
         auto-update-conda: true
         conda-build-version: '3.25'
         activate-environment: ''
         auto-activate-base: true
+        # Released 2023-04-24
+        miniconda-version: 'py310_23.3.1-0'
     - name: Install Conda dependencies
       run: conda install -q conda-verify\<4.0 ripgrep
     - name: Build the Python and libcantera recipe