CHANGELOG core system jobs blocked

CHANGELOG.md

@@ -3,6 +3,7 @@
 IMPROVEMENTS:
  * core: Deregister nodes in batches rather than one at a time [[GH-5784](https://github.com/hashicorp/nomad/pull/5784)
  * core: Removed deprecated upgrade path code pertaining to older versions of Nomad [[GH-5894](https://github.com/hashicorp/nomad/issues/5894)]
+ * core: System jobs that fail because of resource availability are retried when resources are freed [[GH-5900](https://github.com/hashicorp/nomad/pull/5900)]
  * client: Improved task event display message to include kill time out [[GH-5943](https://github.com/hashicorp/nomad/issues/5943)]
  * api: Inferred content type of file in alloc filesystem stat endpoint [[GH-5907](https://github.com/hashicorp/nomad/issues/5907)]
  * api: Used region from job hcl when not provided as query parameter in job registration and plan endpoints [[GH-5664](https://github.com/hashicorp/nomad/pull/5664)]