Fix security issues pointed by Quay

Quay is pointing security issues in Freshmaker due to outdated packages. We currently install the
latest package versions available for the fedora version in use. Therefore, to fix the issues,
we needed to upgrade the fedora version.

Freshmaker was using fedora 37, and after upgrading to fedora 38, a number of issues were resolved.
The rest of the issues that are marked as fixable are due to fedora 39 packages, but it won't become
GA before a few weeks from now.

JIRA: CWFHEALTH-2317

Dockerfile

@@ -1,4 +1,4 @@
-FROM registry.fedoraproject.org/fedora:37-x86_64
+FROM registry.fedoraproject.org/fedora:38-x86_64
 
 LABEL \
     name="Freshmaker application" \

yum-packages.txt

@@ -16,7 +16,6 @@ python3-kerberos
 python3-kobo
 python3-kobo-rpmlib
 python3-koji
-python3-krbcontext
 python3-ldap
 python3-libmodulemd
 python3-mock