news: add entry about RHEL 8.5 images

docs/news/unreleased/rhel8.5-support.md

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+# Add support for RHEL 8.5 main image types
+
+OSBuild Composer can now build RHEL 8.5 images.  The following new image types
+are supported: qcow2, vhd, vmdk, openstack, and ami
+
+To support these image types, the following new types were added to support the
+functionality in osbuild.
+
+Stages:
+- org.osbuild.copy
+- org.osbuild.truncate
+- org.osbuild.sfdisk
+- org.osbuild.qemu
+- org.osbuild.mkfs.btrfs
+- org.osbuild.mkfs.ext4
+- org.osbuild.mkfs.fat
+- org.osbuild.mkfs.xfs
+- org.osbuild.grub2.inst
+
+
+Devices:
+- org.osbuild.loopback
+
+Mounts:
+- org.osbuild.btrfs
+- org.osbuild.ext4
+- org.osbuild.fat
+- org.osbuild.xfs