fix: secretkey for systemClientSecret in values.yaml file (#280)

* fix: systemClientSecret key in values.yaml

Updated systemClientSecret with proper secretKey from the datahub-auth-secrets file

* fix: Updated Chart version

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Co-authored-by: Upendra Vedullapalli <upendra.rao.vedullapalli@entur.org>

charts/datahub/values.yaml

@@ -382,7 +382,7 @@ global:
       systemClientId: "__datahub_system"
       systemClientSecret:
         secretRef: "datahub-auth-secrets"
-        secretKey: "token_service_signing_key"
+        secretKey: "system_client_secret"
       tokenService:
         signingKey:
           secretRef: "datahub-auth-secrets"