Update Ironbank

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/grafana/grafana-enterprise-logs	minor	1.4.1 -> v1.5.0
registry1.dso.mil/ironbank/opensource/grafana/loki	patch	2.6.0 -> 2.6.1
registry1.dso.mil/ironbank/opensource/nginx/nginx	minor	1.21.6 -> 1.23.1

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chart/values.yaml

@@ -297,7 +297,7 @@ gel:
     # -- The image repository to use
     repository: ironbank/grafana/grafana-enterprise-logs
     # -- The version of Grafana Enterprise Logs
-    tag: 1.3.0
+    tag: 1.4.0
     # -- Defines the policy how and when images are pulled
     pullPolicy: IfNotPresent
     # -- Additional image pull secrets