ci: use psycopg 3 for the PostgreSQL database tests (#1971)

Co-authored-by: Claude <svc-devxp-claude@slack-corp.com>

Author: WilliamBergamin

.github/workflows/ci-build.yml

@@ -152,7 +152,7 @@ jobs:
           pip install -r requirements/databases.txt
       - name: Run sync tests (PostgreSQL)
         env:
-          TEST_DATABASE_URL: postgresql://test_user:password@localhost/test
+          TEST_DATABASE_URL: postgresql+psycopg://test_user:password@localhost/test
         run: |
           PYTHONPATH=$PWD:$PYTHONPATH pytest -s tests/slack_sdk/oauth/installation_store/test_sqlalchemy.py
           PYTHONPATH=$PWD:$PYTHONPATH pytest -s tests/slack_sdk/oauth/state_store/test_sqlalchemy.py

requirements/databases.txt

@@ -1,9 +1,9 @@
 # pip install -r requirements/databases.txt
 # Database drivers for CI testing.
 
-# psycopg2-binary
+# psycopg
 # Note: postgreSQL driver (sync).
-psycopg2-binary>=2.9.12,<3
+psycopg[binary]>=3.3.6,<4
 
 # asyncpg
 # Note: postgreSQL driver (async).