Relax required conda-build version

Author: antonwolfy

.github/workflows/conda-package.yml

@@ -254,7 +254,7 @@ jobs:
           (echo CONDA_LIB_BIN_PATH=%CONDA_PREFIX%\Library\bin\) >> %GITHUB_ENV%
 
       - name: Install conda-index
-        run: mamba install conda-index=${{ env.CONDA_INDEX_VERSION }}
+        run: mamba install conda-index"<=${{ env.CONDA_INDEX_VERSION }}"
 
       - name: Create conda channel
         run: |