feat: Upgrade NiFi to 1.27.0, Zookeeper, Sidecar Container, and NiFi …

…Registry (#5)

* fix: revert OIDC admin configuration to use xmlstarlet
* chore: minor updates to chart source and README.md
* feat: Upgrade Nifi to 1.27.0 and Zookeeper charts to 13.4.8. Also upgrade the image versions of the sidecar container and nifi-registry.

Chart.yaml

@@ -1,8 +1,8 @@
 ---
 apiVersion: v2
 name: nifi
-version: 1.2.2
-appVersion: 1.23.2
+version: 1.3.0
+appVersion: 1.27.0
 description: Apache NiFi is a software project from the Apache Software Foundation designed to automate the flow of data between software systems.
 keywords:
   - nifi
@@ -11,7 +11,7 @@ keywords:
 home: https://nifi.apache.org/
 icon: https://svn.apache.org/repos/asf/nifi/site/trunk/images/niFi-logo-horizontal-scaled.png
 source:
-  - https://github.com/cetic/helm-nifi
+  - https://github.com/thefarmersfront/helm-nifi
 maintainers:
   - name: banzo
     email: [email protected]
@@ -27,12 +27,12 @@ maintainers:
     url: https://github.com/zakaria2905
 dependencies:
   - name: zookeeper
-    version: 9.2.7
+    version: 13.4.8
     repository: https://charts.bitnami.com/bitnami
     condition: zookeeper.enabled
   - name: nifi-registry
     alias: registry
-    version: 1.0.0
+    version: 1.1.5
     repository: https://dysnix.github.io/charts/
     condition: registry.enabled
   - name: ca