[stable/inbucket] deprecating chart (#24332)

Signed-off-by: Matt Farina <matt@mattfarina.com>

stable/inbucket/Chart.yaml

@@ -1,8 +1,8 @@
 apiVersion: v1
-description: Inbucket is an email testing application
+description: DEPRECATED - Inbucket is an email testing application
 name: inbucket
 appVersion: 2.0.0
-version: 3.1.1
+version: 3.1.2
 keywords:
   - inbucket
   - mail
@@ -14,8 +14,4 @@ keywords:
 home: https://www.inbucket.org/
 sources:
   - https://github.com/jhillyerd/inbucket
-maintainers:
-  - name: cpanato
-    email: ctadeu@gmail.com
-  - name: jhillyerd
-    email: github@hillyerd.com
+deprecated: true

stable/inbucket/OWNERS

@@ -1,6 +0,0 @@
-approvers:
-- cpanato
-- jhillyerd
-reviewers:
-- cpanato
-- jhillyerd

stable/inbucket/README.md

@@ -7,6 +7,10 @@ For more information, see the Helm Charts [Deprecation and Archive Notice](https
 
 [Inbucket](https://www.inbucket.org/) is an e-mail testing tool.
 
+## DEPRECATION NOTICE
+
+This chart is deprecated and no longer supported.
+
 ## TL;DR;
 
 ```bash