build(deps): switch to 3.9

Author: sgratzl

.github/workflows/ci.yml

@@ -49,7 +49,7 @@ jobs:
             ${{ runner.os }}-conda6-
       - uses: conda-incubator/setup-miniconda@v2
         with:
-          python-version: 3.8
+          python-version: 3.9
           mamba-version: '*'
           channels: conda-forge,defaults
           channel-priority: true

environment.yml

@@ -3,14 +3,16 @@ channels:
   - conda-forge
   - defaults
 dependencies:
-  - python==3.8
+  - python==3.9
   - mypy
   - pylint
   - black
   - bumpversion
+  - ipywidgets
+  - jupyterlab
+  - pandas
   - pytest
   - jupyter
-  - jupyterlab
   - pytest-cov
   - twine
   - sphinx