Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to f842b36613c91f86dd371b590e048e5c4e510f34
  - update for missing nginx tarfile

    This update adds an entry to the docker_images lists file to ensure
    it is saved as a tar file and available for processing in the
    "Prepare infra related images to infra folder" section.

    Change-Id: I293144daa96b3c579443a2e76a407ea04821dce7
    Issue-ID: OOM-1738
    Signed-off-by: eronkeo <ronan.keogh@est.tech>

diff --git a/docs/submodules/oom/offline-installer.git b/docs/submodules/oom/offline-installer.git
index dbc6a72..f842b36 160000 (submodule)
--- a/docs/submodules/oom/offline-installer.git
+++ b/docs/submodules/oom/offline-installer.git
@@ -1 +1 @@
-Subproject commit dbc6a7202dc89264a2857e12c625fb2328584a1e
+Subproject commit f842b36613c91f86dd371b590e048e5c4e510f34