ci: run tutorial notebooks against datajoint-python master branch

Change GitHub Actions workflow to checkout datajoint-python at
master instead of pre/v2.2. pip_requirements.txt already points
to master via git+https.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: dimitri-yatsenko

.github/workflows/development.yml

@@ -17,7 +17,7 @@ jobs:
         uses: actions/checkout@v2
         with:
           repository: datajoint/datajoint-python
-          ref: pre/v2.2
+          ref: master
           path: datajoint-python
       - name: Compile docs static artifacts
         run: |