Add --allowerasing for dnf to replace conflicting pkgs

To fix CI for C9S failing with

```
installed
  - cannot install both policycoreutils-3.6-2.1.el9.x86_64 from baseos and policycoreutils-3.6-7.el9.x86_64 from @System
  - cannot install both policycoreutils-3.6-3.el9.x86_64 from baseos and policycoreutils-3.6-7.el9.x86_64 from @System
  - cannot install both policycoreutils-3.6-4.el9.x86_64 from baseos and policycoreutils-3.6-7.el9.x86_64 from @System
  - cannot install both policycoreutils-3.6-5.el9.x86_64 from baseos and policycoreutils-3.6-7.el9.x86_64 from @System
  - cannot install both policycoreutils-3.6-6.el9.x86_64 from baseos and policycoreutils-3.6-7.el9.x86_64 from @System
```

Signed-off-by: Pragyan Poudyal <pragyanpoudyal41999@gmail.com>

Author: Johan-Liebert1

hack/provision-derived.sh

@@ -48,7 +48,7 @@ case "${ID}-${VERSION_ID}" in
 esac
 
 # Extra packages we install
-grep -Ev -e '^#' packages.txt | xargs dnf -y install
+grep -Ev -e '^#' packages.txt | xargs dnf install --allowerasing -y
 
 # Cloud bits
 cat <<KARGEOF >> /usr/lib/bootc/kargs.d/20-console.toml