Use vcf2zarr in GWAS tutorial notebook

Build docs with Python 3.10

Use %%bash for running vcf2zarr

Author: tomwhite

.github/workflows/check-docs.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9"]
+        python-version: ["3.10"]
 
     steps:
     - uses: actions/checkout@v2

.github/workflows/docs.yml

@@ -15,7 +15,7 @@ jobs:
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
-        python-version: '3.9'
+        python-version: '3.10'
     - name: Install dependencies
       run: |
         sudo apt update -y