update dask-sphinx-theme for GA-4 (#277)

Author: scharlottej13

.github/workflows/ci-build.yaml

@@ -21,7 +21,7 @@ jobs:
         shell: bash -l {0}
         run: |
           mamba install -c conda-forge nbconvert nbformat jupyter_client ipykernel
-          pip install nbsphinx dask-sphinx-theme>=3.0.0 sphinx
+          pip install nbsphinx dask-sphinx-theme>=3.0.5 sphinx
 
       - name: Build
         shell: bash -l {0}