Update helm chart release notes for 1.18.0rc2 (#53061)

Author: jedcunningham

chart/Chart.yaml

@@ -73,6 +73,11 @@ annotations:
       links:
       - name: '#52166'
         url: https://github.com/apache/airflow/pull/52166
+    - description: Allow ``valuesFrom`` in ``gitSync.env``
+      kind: changed
+      links:
+      - name: '#50228'
+        url: https://github.com/apache/airflow/pull/50228
     - description: Fix JWT secret name
       kind: fixed
       links:
@@ -101,6 +106,11 @@ annotations:
       links:
       - name: '#52269'
         url: https://github.com/apache/airflow/pull/52269
+    - description: Fix for ``fernetkey`` and add test of its value
+      kind: fixed
+      links:
+      - name: '#52977'
+        url: https://github.com/apache/airflow/pull/52977
     - description: 'Docs: Update supported executors in docs'
       kind: changed
       links:

chart/RELEASE_NOTES.rst

@@ -23,7 +23,7 @@ Run ``helm repo update`` before upgrading the chart to the latest version.
 
 .. towncrier release notes start
 
-Airflow Helm Chart 1.18.0 (2025-07-07)
+Airflow Helm Chart 1.18.0 (2025-07-12)
 --------------------------------------
 
 Significant Changes
@@ -35,6 +35,7 @@ Improvements
 ^^^^^^^^^^^^
 - Allow ConfigMap and Secret references in ``apiServer.env`` (#51191)
 - Add custom annotations to JWT Secret (#52166)
+- Allow ``valuesFrom`` in ``gitSync.env`` (#50228)
 
 Bug Fixes
 ^^^^^^^^^
@@ -43,6 +44,7 @@ Bug Fixes
 - Change default executor in pod template to support executor parameter in task (#49433)
 - Use ``merged`` to render airflow.cfg and include computed defaults (#51828)
 - Use ``[api] secret_key`` for Airflow 3.0+ instead of ``[webserver] secret_key`` (#52269)
+- Fix for ``fernetkey`` and add test of its value (#52977)
 
 Doc only changes
 ^^^^^^^^^^^^^^^^

chart/reproducible_build.yaml

@@ -1,2 +1,2 @@
-release-notes-hash: e89649eb9f09ea3c8ca7cdf2f0a354cd
-source-date-epoch: 1751565753
+release-notes-hash: e574f907453a7e8b1b2f6cc0b96baee8
+source-date-epoch: 1752095894