[stable/prometheus] Add myself to OWNERS (#18737)

Signed-off-by: Mingchin Hsieh <zanhsieh@gmail.com>

stable/prometheus/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: prometheus
-version: 9.3.1
+version: 9.3.2
 appVersion: 2.13.1
 description: Prometheus is a monitoring system and time series database.
 home: https://prometheus.io/
@@ -12,9 +12,9 @@ sources:
   - https://github.com/prometheus/node_exporter
   - https://github.com/kubernetes/kube-state-metrics
 maintainers:
-  - name: mgoodness
-    email: mgoodness@gmail.com
   - name: gianrubio
     email: gianrubio@gmail.com
+  - name: zanhsieh
+    email: zanhsieh@gmail.com
 engine: gotpl
 tillerVersion: ">=2.8.0"

stable/prometheus/OWNERS

@@ -1,6 +1,6 @@
 approvers:
-- mgoodness
 - gianrubio
+- zanhsieh
 reviewers:
-- mgoodness
 - gianrubio
+- zanhsieh