Temporary limit Pandas version (#21045)

This is likely only for couple of days to avoid test failures
in `main`. When the 3.4.4 version of Flask Builder gets
released we should be able to relax the limit as it will allow
us to migrate to sqlalchemy 1.4

(cherry picked from commit eac7cbe)

setup.py

@@ -179,7 +179,10 @@ def write_version(filename: str = os.path.join(*[my_dir, "airflow", "git_version
         file.write(text)
 
 
-pandas_requirement = 'pandas>=0.17.1, <2.0'
+# We limit Pandas to <1.4 because Pandas 1.4 requires SQLAlchemy 1.4 which
+# We should remove the limits as soon as Flask App Builder releases version 3.4.4
+# Release candidate is there: https://pypi.org/project/Flask-AppBuilder/3.4.4rc1/
+pandas_requirement = 'pandas>=0.17.1, <1.4'
 
 # 'Start dependencies group' and 'Start dependencies group' are mark for ./scripts/ci/check_order_setup.py
 # If you change this mark you should also change ./scripts/ci/check_order_setup.py