Update docker.io/jenkins/jenkins Docker tag to v2.501

Dockerfile

@@ -1,6 +1,6 @@
 # Dockerfile
 # Jenkins LTS as of 2023-05-03
-FROM  docker.io/jenkins/jenkins:2.546-jdk21
+FROM  docker.io/jenkins/jenkins:2.501-jdk21
 
 USER root
 

README.md

@@ -13,6 +13,5 @@ Prerequisites:
 The secret:
 
 ```
-kubectl create ns build
-kubectl create secret docker-registry registry-credentials --docker-username='robot$jenkins' --docker-password=XXXXXXXXXXXXXXXXXXXXXX --docker-email=matthias.hinrichs@me.com  --docker-server='https://harbor.hnrx.net -n build
+kubectl create secret docker-registry registry-credentials --docker-username='robot$jenkins' --docker-password=XXXXXXXXXXXXXXXXXXXXXX --docker-email=matthias.hinrichs@me.com  --docker-server='https://harbor.hnrx.net
 ```

renovate.json

@@ -1,18 +1,3 @@
 {
-  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "platformAutomerge": true,
-  "packageRules": [
-    {
-      "matchUpdateTypes": [
-        "minor",
-        "patch",
-        "pin",
-        "digest"
-      ],
-      "ignoreTests": true,
-      "automerge": true,
-      "automergeType": "pr"
-    }
-  ]
-
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json"
 }