Update jupyterhub pinning to >=5.2.0,<6 from ==5.1.0

tljh/requirements-hub-env.txt

@@ -8,7 +8,7 @@
 # If a dependency is bumped to a new major version, we should make a major
 # version release of tljh.
 #
-jupyterhub>=5.1.0,<5.2.0
+jupyterhub>=5.2.0,<6
 jupyterhub-systemdspawner>=1.0.1,<2
 jupyterhub-firstuseauthenticator>=1.1.0,<2
 jupyterhub-nativeauthenticator>=1.3.0,<2