Update git submodules

Update git submodules

* Update docs/submodules/oom/offline-installer.git from branch 'master'
  to ac6b1c0d5ba8e5cc136ad3f7f9d87f7fecdbda53
  - Merge "nginx update for long server names"
  - nginx update for long server names

    This issue addresses the following
    error when starting nginx container:
      nginx: [emerg] could not build the \
      server_names_hash, you should increase \
      server_names_hash_bucket_size: 64

    Change-Id: I369075edd16801aca6b09c6727370060225c428c
    Issue-ID: OOM-1765
    Signed-off-by: eronkeo <ronan.keogh@est.tech>