[Condalock] make sure mamba/conda are at latest version by forcing a …

…pinned mamba install (#2136)

.github/workflows/create-condalock-file.yml

@@ -31,19 +31,24 @@ jobs:
  miniforge-version: "latest"
  miniforge-variant: Mambaforge
  use-mamba: true
- - name: Show conda config
+ - name: Update and show conda config
  run: |
  conda update -n base -c conda-forge conda
  conda info
  conda list
  conda config --show-sources
  conda config --show
+ # setup-miniconda@v2 installs an old conda and mamba
+ # forcing a modern mamba updates both mamba and conda
+ conda install -c conda-forge "mamba>=1.4.8"
+ conda --version
+ mamba --version
  - name: Gather Python info
  run: |
  which python
  python --version
  - name: Install conda-lock
- run: mamba install -y conda-lock
+ run: mamba install -y -c conda-forge conda-lock
  - name: Check version of conda-lock
  run: conda-lock --version
  - name: Create conda lock file for linux-64