Update dependency renovate to ^19.231.4

This MR contains the following updates:

Package	Type	Update	Change
renovate (source)	dependencies	patch	^19.231.2 -> ^19.231.4

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

---

Release Notes

renovatebot/renovate

v19.231.4

Compare Source

19.231.4 (2020-05-05)

Bug Fixes

• fetch file list from head not origin (e531a93)

v19.231.3

Compare Source

19.231.3 (2020-05-05)

Bug Fixes

• packageFiles per baseBranch (#​6136) (2ff90b2)

Code Refactoring

• remove unused branchName param in getFileList (82ca814)

---

Renovate configuration

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

🚦 Automerge: Enabled.

♻ Rebasing: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

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

---

• If you want to rebase/retry this MR, check this box

---

This MR has been generated by Renovate Bot.