Annual review of the OWNERS file (2023): Maartje moved to Emeritus Maintainer

Ref: cert-manager/cert-manager#6231

Signed-off-by: Maël Valais <mael@vls.dev>

Author: maelvls

OWNERS

@@ -1,7 +1,6 @@
 approvers:
 - munnerz
 - joshvanl
-- meyskens
 - wallrj
 - jakexks
 - maelvls
@@ -10,9 +9,8 @@ approvers:
 reviewers:
 - munnerz
 - joshvanl
-- meyskens
 - wallrj
 - jakexks
 - maelvls
 - irbekrm
-- inteon
+- inteon