Update sbt-scalafix to 0.13.0

[typelevel-steward]

About this PR

📦 Updates ch.epfl.scala:sbt-scalafix from 0.12.1 to 0.13.0

📜 GitHub Release Notes - Version Diff

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^{labels: sbt-plugin-update, early-semver-major, semver-spec-minor, commit-count:1}

[armanbilge]

This was a breaking bump for sbt-scalafix so we might want to bump the sbt-typelevel base version 🤔

The release notes for sbt-scalafix say:

Dropped support for sbt 1.3.x

Which isn't a problem for us (we already require a newer sbt version).

However, this also ships scalafix v0.13.0 which includes some breaking changes for rule authors ...

Scalameta was bumped from 4.9.3 to 4.10.1 ... breaking forward & backward compatibility

[mzuehlke]

Good comment, I was missing that change.
I will add another comment on #751

[armanbilge]

I decided that we can relatively safely move forward without bumping the base version, see #751 (comment).