ci(workflows): update release-helm workflow to use ubuntu-latest

Update the Helm chart release workflow from ubuntu-20.04 to ubuntu-latest to use a more recent runner version.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: STRRL

.github/workflows/release-helm.yaml

@@ -9,7 +9,7 @@ permissions: read-all
 
 jobs:
   release-chart:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
       - name: "Extract Version"