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

@@ -221,7 +221,7 @@ loki-simple-scalable:
     image:
       registry: registry1.dso.mil
       repository: ironbank/opensource/nginx/nginx
-      tag: 1.21.6
+      tag: 1.23.0
     # Gateway service configuration
     service:
       # -- Port of the gateway service
@@ -613,7 +613,7 @@ bbtests:
       cypress_check_datasource: 'false'
       cypress_grafana_url: 'http://monitoring-grafana.monitoring.svc.cluster.local'
   scripts:
-    image: registry1.dso.mil/ironbank/big-bang/base:1.18.0
+    image: registry1.dso.mil/ironbank/big-bang/base:2.0.0
     envs:
       LOKI_URL: 'http://{{ template "loki.fullname" . }}.{{ .Release.Namespace }}.svc:3100'
       LOKI_VERSION: '{{ .Values.loki.image.tag }}'