Add contents read permission for release chart (#564)

*Issue #, if available:*

*Description of changes:*
Add contents read permission for release chart

The release chart workflow failed:
https://github.com/aws/secrets-store-csi-driver-provider-aws/actions/runs/21648520700

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Author: i-am-SR

.github/workflows/release-chart.yml

@@ -4,6 +4,7 @@ on:
   workflow_dispatch:
 
 permissions:
+  contents: read
   id-token: write
 
 jobs: