Update CHANGELOG.md

Signed-off-by: Norman Ziegner <[email protected]>

Author: Normo

CHANGELOG.md

@@ -10,6 +10,7 @@
 
 **Merged pull requests:**
 
+- Prepare release version 6.3.1 [\#534](https://github.com/hifis-net/ansible-collection-toolkit/pull/534) ([Normo](https://github.com/Normo))
 - gitlab: fix check for batched background migrations [\#533](https://github.com/hifis-net/ansible-collection-toolkit/pull/533) [[gitlab](https://github.com/hifis-net/ansible-collection-toolkit/labels/gitlab)] ([Normo](https://github.com/Normo))
 - gitlab-runner: Bump fleeting-plugin-openstack to v0.33.0 [\#532](https://github.com/hifis-net/ansible-collection-toolkit/pull/532) [[gitlab_runner](https://github.com/hifis-net/ansible-collection-toolkit/labels/gitlab_runner)] ([Normo](https://github.com/Normo))
 - gitlab-runner: Fix empty gitlab\_runner\_version evaluation in version test [\#531](https://github.com/hifis-net/ansible-collection-toolkit/pull/531) [[gitlab_runner](https://github.com/hifis-net/ansible-collection-toolkit/labels/gitlab_runner)] ([Normo](https://github.com/Normo))