Upgrading robotframework confluentkafka lib

- upgrading confluentkafka library for robotframework to 2.4.0-2
- reverted the change for the CSIT as the fix was done in the
  dmi-plugin-stub

Issue-ID: CPS-2363
Change-Id: I3f7cd622177485435566ef814ffb38d4a93ed0ad
Signed-off-by: mpriyank <priyank.maheshwari@est.tech>
diff --git a/csit/tests/cps-data-operations/cps-data-operations.robot b/csit/tests/cps-data-operations/cps-data-operations.robot
index 85e8a2a..6ac2a95 100644
--- a/csit/tests/cps-data-operations/cps-data-operations.robot
+++ b/csit/tests/cps-data-operations/cps-data-operations.robot
@@ -63,8 +63,7 @@
         Compare Header Values       ${header_key_value_pair[0]}   ${header_key_value_pair[1]}      "ce_specversion"      "1.0"
         Compare Header Values       ${header_key_value_pair[0]}   ${header_key_value_pair[1]}      "ce_type"             "org.onap.cps.ncmp.events.async1_0_0.DataOperationEvent"
         Compare Header Values       ${header_key_value_pair[0]}   ${header_key_value_pair[1]}      "ce_correlationid"    "${expectedRequestId}"
-        # Need to check the root cause of this failure. To be investigated separately as part of CPS-2363
-        # Compare Header Values       ${header_key_value_pair[0]}   ${header_key_value_pair[1]}      "ce_source"           "DMI"
+        Compare Header Values       ${header_key_value_pair[0]}   ${header_key_value_pair[1]}      "ce_source"           "DMI"
     END
     [Teardown]                      Basic Teardown                    ${group_id}