Merge pull request ceph#62242 from rhcs-dashboard/pin-xmlsec

mgr/dashboard: pin lxml to fix run-dashboard-tox-make-check failure

Author: nizamial09

src/pybind/mgr/dashboard/requirements.txt

@@ -14,3 +14,4 @@ jsonpatch
 grpcio==1.46.5
 grpcio-tools==1.46.5
 jmespath
+lxml==4.8.0  # to fix https://github.com/xmlsec/python-xmlsec/issues/320