Remove zeitlinger from disk-buffering component owners

Disk buffering is primarily used for mobile observability, which is
outside my area of expertise. Leaving @LikeTheSalad as sole owner.
Signed-off-by: Gregor Zeitlinger <gregor.zeitlinger@grafana.com>

Author: zeitlinger

.github/component_owners.yml

@@ -39,7 +39,6 @@ components:
     - PeterF778
   disk-buffering:
     - LikeTheSalad
-    - zeitlinger
   gcp-resources:
     - jsuereth
     - psx95

disk-buffering/README.md

@@ -188,6 +188,5 @@ the reading and the writing actions are executed within the same application pro
 ## Component owners
 
 - [Cesar Munoz](https://github.com/LikeTheSalad), Elastic
-- [Gregor Zeitlinger](https://github.com/zeitlinger), Grafana
 
 Learn more about component owners in [component_owners.yml](../.github/component_owners.yml).