changelog: batch of bug fixes for 0.12.4 (#8767)

CHANGELOG.md

@@ -9,7 +9,11 @@ BUG FIXES:
 
  * core: Fixed a bug where unpromoted job versions are used when rescheduling failed allocations [[GH-8691](https://github.com/hashicorp/nomad/issues/8691)]
  * core: Fixed bugs where scaling policies could be matched against incorrect jobs with a similar prefix [[GH-8753](https://github.com/hashicorp/nomad/issues/8753)]
+* core: Fixed a bug where garbage collection evaluations that failed or spanned leader elections would be re-enqueued forever. [[GH-8682](https://github.com/hashicorp/nomad/issues/8682)]
  * core (Enterprise): Fixed a bug where enterprise servers may self-terminate as licenses are ignored after a Raft snapshot restore. [[GH-8737](https://github.com/hashicorp/nomad/issues/8737)]
+* csi: Fixed a bug where querying CSI volumes would cause a panic if an allocation that claimed the volume had been garbage collected but the claim was not yet dropped. [[GH-8735](https://github.com/hashicorp/nomad/issues/8735)]
+* deployments (Enterprise): Fixed a bug where counts could not be changed in the web UI for multiregion jobs. [[GH-8685](https://github.com/hashicorp/nomad/issues/8685)]
+* deployments (Enterprise): Fixed a bug in multi-region deployments where a region that was dropped from the jobspec was not deregistered. [[GH-8763](https://github.com/hashicorp/nomad/issues/8763)]
 
 ## 0.12.3 (August 13, 2020)