Add apt-upgrade for base

Add apt-upgrade for the base so that if the underlying Debian
that is used for the base of the php image has updates, such as for
Apache HTTP Server, they will be picked up even if the base php image
has not been rebuilt and already picked them up.

comanage-registry-base/Dockerfile

@@ -23,7 +23,9 @@ FROM php:7.3.33-apache-bullseye
 # --with-mbstring
 # but xls, pdo, pdo_mysql, pdo_pgsql, mysqli, pgsql, 
 # and ldap extensions must be built.
-RUN apt-get update && apt-get install -y \
+RUN apt-get update \
+      && apt-get upgrade -y \
+      && apt-get install -y \
          libldap-2.4-2 \
          libldap2-dev \
          libmariadb-dev \