Increased Oracle version of build tree to 12.2

continuousintegration/docker/ctafrontend/cc7/buildtree-stage1-rpms/Dockerfile

@@ -65,9 +65,9 @@ RUN yum-config-manager --enable epel --setopt="epel.priority=4" \
       xrootd-client \
       xrootd-debuginfo \
       xrootd-server \
-      oracle-instantclient12.1-basic \
-      oracle-instantclient12.1-meta \
-      oracle-instantclient12.1-sqlplus \
+      oracle-instantclient12.2-basic \
+      oracle-instantclient12.2-meta \
+      oracle-instantclient12.2-sqlplus \
       cgdb \
       less \
       psmisc \