Update micromamba version in image build workflow (#654)

Author: claytonparnell

.github/workflows/build-image.yml

@@ -40,7 +40,7 @@ jobs:
       target_version: ${{ steps.calc_target.outputs.target_version }}
     steps:
       - uses: actions/checkout@v4
-      - uses: mamba-org/setup-micromamba@v1
+      - uses: mamba-org/setup-micromamba@v2
         with:
           environment-file: ./environment.lock
           environment-name: sagemaker-distribution