Update Ironbank to v15.5.2

This MR contains the following updates:

Package	Update	Change
ironbank/gitlab/gitlab/gitlab-webservice	patch	15.5.0 -> 15.5.2
registry1.dso.mil/ironbank/gitlab/gitlab/alpine-certificates	patch	15.5.0 -> 15.5.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitaly	patch	15.5.0 -> 15.5.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-container-registry	patch	15.5.0 -> 15.5.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-exporter	minor	15.4.1 -> 15.5.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-mailroom	patch	15.5.0 -> 15.5.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-shell	patch	15.5.0 -> 15.5.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-sidekiq	patch	15.5.0 -> 15.5.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-toolbox	patch	15.5.0 -> 15.5.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-webservice	patch	15.5.0 -> 15.5.2
registry1.dso.mil/ironbank/gitlab/gitlab/gitlab-workhorse	patch	15.5.0 -> 15.5.2
registry1.dso.mil/ironbank/gitlab/gitlab/kubectl	patch	15.5.0 -> 15.5.2

---

Configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Renovate will not automatically rebase this PR, because other commits have been found.

🔕 Ignore: Close this MR and you won't be reminded about these updates again.

---

• If you want to rebase/retry this MR, click this checkbox.

---

This MR has been generated by Renovate Bot.

---

relates to #157 (closed)