fix: fix CI's python version and requirements.txt

Author: hsluoyz

.github/workflows/release.yml

@@ -124,7 +124,7 @@ jobs:
       - name: Set up python
         uses: actions/setup-python@v2
         with:
-          python-version: 3.8
+          python-version: 3.9
 
       - name: Install setuptools
         run: python -m pip install --upgrade setuptools wheel twine

requirements.txt

@@ -1,2 +1,2 @@
 casbin>=0.8.4
-psycopg2-binary>=2.8.6<=2.9.3
+psycopg2-binary>=2.8.6