Feature request: update `mise.toml` during engine update PRs

[alexplatteeuw]

Hello 👋

We use mise (mise-en-place) as our version manager, which uses a mise.toml file instead of .tool-versions. Currently, when depfu opens a PR to update the Ruby or Node engine version, it doesn't patch mise.toml.

Could you add support for mise.toml as a file to update during engine updates? Renovate already supports this format natively.

Mise is gaining a lot of traction in the Ruby/Node ecosystem, so this would probably benefit quite a few of your users!

Thanks 🙏