[8.11] [build] Update ironbank base to UBI 9.3 (#170910) (#170940)

# Backport

This will backport the following commits from `main` to `8.11`:
- [[build] Update ironbank base to UBI 9.3
(#170910)](#170910)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT
[{"author":{"name":"Jon","email":"[email protected]"},"sourceCommit":{"committedDate":"2023-11-09T12:48:15Z","message":"[build]
Update ironbank base to UBI 9.3
(#170910)","sha":"1d35c0f013286f6cae32ec5d0cb5c9d64287a4e8","branchLabelMapping":{"^v8.12.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["Team:Operations","release_note:skip","backport:all-open","v8.12.0"],"number":170910,"url":"https://github.com/elastic/kibana/pull/170910","mergeCommit":{"message":"[build]
Update ironbank base to UBI 9.3
(#170910)","sha":"1d35c0f013286f6cae32ec5d0cb5c9d64287a4e8"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v8.12.0","labelRegex":"^v8.12.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/170910","number":170910,"mergeCommit":{"message":"[build]
Update ironbank base to UBI 9.3
(#170910)","sha":"1d35c0f013286f6cae32ec5d0cb5c9d64287a4e8"}}]}]
BACKPORT-->

Co-authored-by: Jon <[email protected]>

src/dev/build/tasks/os_packages/docker_generator/templates/ironbank/Dockerfile

@@ -4,7 +4,7 @@
 ################################################################################
 ARG BASE_REGISTRY=registry1.dso.mil
 ARG BASE_IMAGE=redhat/ubi/ubi9
-ARG BASE_TAG=9.2
+ARG BASE_TAG=9.3
 
 FROM ${BASE_REGISTRY}/${BASE_IMAGE}:${BASE_TAG} as prep_files
 

src/dev/build/tasks/os_packages/docker_generator/templates/ironbank/hardening_manifest.yaml

@@ -14,7 +14,7 @@ tags:
 # Build args passed to Dockerfile ARGs
 args:
   BASE_IMAGE: 'redhat/ubi/ubi9'
-  BASE_TAG: '9.2'
+  BASE_TAG: '9.3'
 
 # Docker image labels
 labels: