ci: don't use conda

.github/workflows/test_unit_standalone.yml

@@ -33,22 +33,10 @@ jobs:
       uses: actions/checkout@v4
 
     - name: setup python # ${{ matrix.python-version }}
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python-version }}
 
-    #- name: create conda env
-    #  run: $CONDA/bin/conda env create -f environment.yml
-
-    - name: activate conda
-      uses: conda-incubator/setup-miniconda@v3
-      with:
-        activate-environment: bmi_lstm
-        environment-file: ./environment.yml
-        #python-version: ${{ matrix.python-version }}
-        # this may not be necessary? tbd..
-        auto-activate-base: false
-
     - name: install packages
       run: |
         python -m pip install --upgrade pip