DROP: Add NEXTSTRAIN_CONDA_MICROMAMBA_VERSION: 2.1.0 to CI

This is needed for the CI workflow to complete successfully until
nextstrain/cli#430 is merged and released.

Author: joverlee521

.github/workflows/ci.yaml

@@ -161,6 +161,7 @@ jobs:
       env: |
         NEXTSTRAIN_CONDA_CHANNEL: nextstrain/label/${{ needs.generate-version.outputs.label }}
         NEXTSTRAIN_CONDA_BASE_PACKAGE: nextstrain-base ==${{ needs.generate-version.outputs.version }}
+        NEXTSTRAIN_CONDA_MICROMAMBA_VERSION: 2.1.0
       artifact-name: ${{ matrix.pathogen }}-outputs
       continue-on-error: true
 
@@ -196,5 +197,6 @@ jobs:
       env: |
         NEXTSTRAIN_CONDA_CHANNEL: nextstrain/label/${{ needs.generate-version.outputs.label }}
         NEXTSTRAIN_CONDA_BASE_PACKAGE: nextstrain-base ==${{ needs.generate-version.outputs.version }}
+        NEXTSTRAIN_CONDA_MICROMAMBA_VERSION: 2.1.0
       artifact-name: ${{ matrix.pathogen }}-outputs
       continue-on-error: true