Merge pull request #6109 from vincepri/promote-sbueringer

🌱 Promote sbueringer to Cluster API maintainer

Author: k8s-ci-robot

OWNERS_ALIASES

@@ -22,6 +22,7 @@ aliases:
   - CecileRobertMichon
   - enxebre
   - fabriziopandini
+  - sbueringer
   - vincepri
 
   # folks who can review and LGTM any PRs in the repo
@@ -76,7 +77,6 @@ aliases:
 
   cluster-api-test-reviewers:
   cluster-api-test-maintainers:
-  - sbueringer
 
   # -----------------------------------------------------------
   # OWNER_ALIASES for test/framework