Update build_docs.yaml

Author: lufre1

.github/workflows/build_docs.yaml

@@ -23,7 +23,7 @@ jobs:
       uses: actions/checkout@v4
 
     - name: Set up Micromamba
-      uses: mamba-org/setup-micromamba@v4
+      uses: mamba-org/setup-micromamba@v2
       with:
         micromamba-version: "latest"       # Use the latest version of micromamba
         environment-file: .github/doc_env.yaml  # Reference your environment.yml file