chore(ci): removing unneccessary packages from target images

Signed-off-by: Raphael Defosseux <raphael.defosseux@openairinterface.org>

docker/Dockerfile.nrf.rhel9

@@ -104,8 +104,7 @@ RUN rm -f /etc/rhsm-host && \
       libicu \
       boost \
       libevent \
-      findutils \
-      libconfig && \
+      findutils && \
     microdnf clean all -y && \
     rm -rf /var/cache/yum /var/cache/dnf && \
     # Remove entitlements and Subscription Manager configs

docker/Dockerfile.nrf.rocky9

@@ -86,8 +86,7 @@ RUN microdnf update -y && \
       libicu \
       boost \
       libevent \
-      findutils \
-      libconfig && \
+      findutils && \
     microdnf clean all -y && \
     rm -rf /var/cache/yum /var/cache/dnf