[AIRFLOW-XXX] Pin sqlalchemy dependency

scripts/ci/requirements.txt

@@ -87,7 +87,7 @@ sphinx
 sphinx-argparse
 Sphinx-PyPI-upload
 sphinx_rtd_theme
-sqlalchemy
+sqlalchemy>=1.1.15, <1.2.0
 statsd
 thrift
 thrift_sasl

setup.py

@@ -226,7 +226,7 @@ def do_setup():
             'python-nvd3==0.14.2',
             'requests>=2.5.1, <3',
             'setproctitle>=1.1.8, <2',
-            'sqlalchemy>=0.9.8',
+            'sqlalchemy>=1.1.15, <1.2.0',
             'sqlalchemy-utc>=0.9.0',
             'tabulate>=0.7.5, <0.8.0',
             'thrift>=0.9.2',