Run postgres in tox on port 3309

This lets us run the dev server at the same time as running tox.

tox.ini

@@ -25,15 +25,15 @@ healthcheck_start_period = 1
 [docker:test-postgres]
 image = postgres:11
 ports =
-    3308:3308/tcp
+    3309:3309/tcp
 # Environment variables are passed to the container. They are only
 # available to that container, and not to the testenv, other
 # containers, or as replacements in other parts of tox.ini
 environment =
     POSTGRES_PASSWORD=password
     POSTGRES_USER=user
     POSTGRES_DB=keepertest
-    PGPORT=3308
+    PGPORT=3309
 # The healthcheck ensures that tox-docker won't run tests until the
 # container is up and the command finishes with exit code 0 (success)
 healthcheck_cmd = PGPASSWORD=$POSTGRES_PASSWORD psql \
@@ -65,7 +65,7 @@ description = Run pytest with Postgres DB.
 docker =
     test-postgres
 setenv =
-    LTD_KEEPER_TEST_DB_URL=postgresql+psycopg2://user:password@localhost:3308/keepertest
+    LTD_KEEPER_TEST_DB_URL=postgresql+psycopg2://user:password@localhost:3309/keepertest
 
 [testenv:mysql]
 description = Run pytest with MySQL DB.