Update FAB to latest released from 3.4 line (3.4.5) (apache#22596)

We checked that the changes introduced between 3.4.4 and 3.4.5
do not require from us to change the vendored-in security manager.

setup.cfg

@@ -108,7 +108,7 @@ install_requires =
     # Every time we update FAB version here, please make sure that you review the classes and models in
     # `airflow/www/fab_security` with their upstream counterparts. In particular, make sure any breaking changes,
     # for example any new methods, are accounted for.
-    flask-appbuilder==3.4.4
+    flask-appbuilder==3.4.5
     flask-caching>=1.5.0, <2.0.0
     flask-login>=0.3, <0.5
     # Strict upper-bound on the latest release of flask-session,