Revert "[patch] update db2u v120105.0"

This reverts commit 229223e.

Author: prveenkumr

src/mas/devops/data/catalogs/v9-260827-amd64.yaml

@@ -49,7 +49,7 @@ db2u_version: 7.6.0+20260224.123157.19264        # Operator version 120104.0.0 (
 db2u_extras_version: 1.0.6                       # No Update
 db2u_filter: db2
 
-db2_channel_default: v120105.0                   # Default Channel version for db2u-operator
+db2_channel_default: v120104.0                   # Default Channel version for db2u-operator
 
 
 # Dependencies - CouchDb

src/mas/devops/data/catalogs/v9-260827-ppc64le.yaml

@@ -20,7 +20,7 @@ ocp_compatibility:
 # -----------------------------------------------------------------------------
 db2u_version: 7.6.0+20260224.123157.19264        # Operator version 120104.0.0 (https://github.com/IBM/cloud-pak/tree/master/repo/case/ibm-db2uoperator)
 
-db2_channel_default: v120105.0                   # Default Channel version for db2u-operator
+db2_channel_default: v120104.0                   # Default Channel version for db2u-operator
 
 
 # Dependencies - UDS

src/mas/devops/data/catalogs/v9-260827-s390x.yaml

@@ -20,7 +20,7 @@ ocp_compatibility:
 # -----------------------------------------------------------------------------
 db2u_version: 7.6.0+20260224.123157.19264        # Operator version 120104.0.0 (https://github.com/IBM/cloud-pak/tree/master/repo/case/ibm-db2uoperator)
 
-db2_channel_default: v120105.0                   # Default Channel version for db2u-operator
+db2_channel_default: v120104.0                   # Default Channel version for db2u-operator
 
 
 # Dependencies - UDS