When auto merging a renovate pull request the commit title is not updated on rebase

[AtzeDeVries]

When renovate creates a PR with automerge enabled and the PR is later updated the squash merge commit contains the initial (old) commit title. The body is updated.

Example:
https://github.com/coopnorge/helloworld/commit/e3defc0f6550f072803b53a473a98af95ee622be