fix(koolbox): Reduce friction on image build

Currently the image builds fail mostly due to this upgrade step, let's
see how things work without.

images/koolbox/Dockerfile

@@ -135,8 +135,6 @@ FROM registry.fedoraproject.org/fedora:36
 ARG MAINTAINER="unmaintained"
 LABEL maintainer=$MAINTAINER
 
-RUN dnf upgrade -y
-
 RUN dnf install -y \
       bash \
       ca-certificates \