Update sbt to 1.9.6

[scala-steward]

About this PR

📦 Updates org.scala-sbt:sbt from 1.9.4 to 1.9.6

📜 GitHub Release Notes - Version Diff

Usage

✅ Please merge!

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

If you'd like to skip this version, you can just close this PR. If you have any feedback, just mention me in the comments below.

Configure Scala Steward for your repository with a .scala-steward.conf file.

Have a fantastic day writing Scala!

⚙ Adjust future updates

Add this to your `.scala-steward.conf` file to ignore future updates of this dependency: ``` updates.ignore = [ { groupId = "org.scala-sbt", artifactId = "sbt" } ] ``` Or, add this to slow down future updates of this dependency: ``` dependencyOverrides = [{ pullRequests = { frequency = "30 days" }, dependency = { groupId = "org.scala-sbt", artifactId = "sbt" } }] ```

^{labels: library-update, early-semver-patch, semver-spec-patch, version-scheme:early-semver, commit-count:1}

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.05% :warning:

Comparison is base (dd86eea) 91.74% compared to head (4aeb735) 91.70%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1043 +/- ## ========================================== - Coverage 91.74% 91.70% -0.05% ========================================== Files 91 91 Lines 9487 9487 Branches 2224 2224 ========================================== - Hits 8704 8700 -4 - Misses 783 787 +4 ``` [see 4 files with indirect coverage changes](https://app.codecov.io/gh/johnynek/bosatsu/pull/1043/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=P.+Oscar+Boykin)

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