RHINENG-12554: rebase images to ubi9

Dockerfile

@@ -1,15 +1,14 @@
-ARG BUILDIMG=registry.access.redhat.com/ubi8
-ARG RUNIMG=registry.access.redhat.com/ubi8-micro
+ARG BUILDIMG=registry.access.redhat.com/ubi9
+ARG RUNIMG=registry.access.redhat.com/ubi9-micro
 FROM ${BUILDIMG} as buildimg
 
 ARG INSTALL_TOOLS=no
 
 # install build, development and test environment
-RUN dnf module enable -y postgresql:16 || curl -o /etc/yum.repos.d/postgresql.repo \
-        https://copr.fedorainfracloud.org/coprs/mmraka/postgresql-16/repo/epel-8/mmraka-postgresql-16-epel-8.repo
+RUN curl -o /etc/yum.repos.d/postgresql.repo \
+        https://copr.fedorainfracloud.org/coprs/mmraka/postgresql-16/repo/epel-9/mmraka-postgresql-16-epel-9.repo
 
-RUN dnf install -y go-toolset postgresql diffutils rpm-devel pg_repack && \
-    ln -s /usr/libexec/platform-python /usr/bin/python3
+RUN dnf install -y go-toolset postgresql diffutils rpm-devel pg_repack
 
 ENV GOPATH=/go \
     GO111MODULE=on \