Explicitly install osbuild-selinux to avoid dependency problems

in
https://gitlab.com/redhat/services/products/image-builder/ci/manifest-db/-/jobs/7078915125
I am seeing:

Error:
 Problem 1: problem with installed package selinux-policy-targeted-38.1.12-1.el9.noarch
  - package osbuild-121-1.20240606gitfaaa0bf.el9.noarch requires (osbuild-selinux if selinux-policy-targeted), but none of the providers can be installed
  - package osbuild-selinux-97-1.el9.noarch requires osbuild = 97-1.el9, but none of the providers can be installed
  - cannot install both osbuild-97-1.el9.noarch and osbuild-121-1.20240606gitfaaa0bf.el9.noarch
  - cannot install the best candidate for the job
  - nothing provides selinux-policy >= 38.1.36-1.el9 needed by osbuild-selinux-121-1.20240606gitfaaa0bf.el9.noarch
  - nothing provides selinux-policy-base >= 38.1.36-1.el9 needed by osbuild-selinux-121-1.20240606gitfaaa0bf.el9.noarch
 Problem 2: problem with installed package selinux-policy-38.1.12-1.el9.noarch

where I thought that osbuild-selinux should be pulled in automatically
but for some reason it isn't.

Related: COMPOSER-2227

schutzbot/deploy.sh

@@ -58,4 +58,5 @@ sudo dnf -y install \
   osbuild-luks2 \
   osbuild-lvm2 \
   osbuild-ostree \
+  osbuild-selinux \
   python3